Update runtime files.
diff --git a/runtime/syntax/gift.vim b/runtime/syntax/gift.vim
new file mode 100644
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--- /dev/null
+++ b/runtime/syntax/gift.vim
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+" Vim syntax file
+"
+" Language: Moodle GIFT (General Import Format Template)
+" Maintainer: Selim Temizer (http://selimtemizer.com)
+" Creation: November 28, 2020
+" Latest Revision: December 21, 2020
+" Note: The order of entities in this file is important!
+
+if version < 600
+ syntax clear
+elseif exists("b:current_syntax")
+ finish
+endif
+
+
+setlocal conceallevel=1
+
+"-----------------------------------------------
+" GIFT entities
+
+syn match giftS "\~" contained "GIFT special characters
+syn match giftS "=" contained
+syn match giftS "#" contained
+syn match giftS "{" contained
+syn match giftS "}" contained
+syn match giftS ":" contained
+
+syn match giftES "\\\~" contained conceal cchar=~ "GIFT escaped special characters
+syn match giftES "\\=" contained conceal cchar==
+syn match giftES "\\#" contained conceal cchar=#
+syn match giftES "\\{" contained conceal cchar={
+syn match giftES "\\}" contained conceal cchar=}
+syn match giftES "\\:" contained conceal cchar=:
+
+syn match giftEN "\\n" contained conceal cchar=n "GIFT escaped newline
+
+syn match giftFormat "\[html]" contained "GIFT formats
+syn match giftFormat "\[plain]" contained
+syn match giftFormat "\[moodle]" contained
+syn match giftFormat "\[markdown]" contained
+
+"--------------------------------------------------------
+" HTML entities
+
+syn match giftH "<" contained "HTML characters that might need to be handled/escaped
+syn match giftH ">" contained
+syn match giftH "&" contained
+
+syn match giftEH "<" contained conceal cchar=< "HTML escaped characters
+syn match giftEH ">" contained conceal cchar=>
+syn match giftEH "&" contained conceal cchar=&
+syn match giftEH " " contained conceal cchar=_
+
+"-------------------------------------------------------
+" Answer components: Feedback and general feedback
+
+syn match giftFB "#\_.\{-}\(\_^\|[^\\]\)\ze\(=\|\~\|#\|####\|}\)" contained contains=giftF "Feedback block
+syn match giftF "#\zs\_.\{-}\(\_^\|[^\\]\)\ze\(=\|\~\|#\|####\|}\)" contained contains=@giftCEF "Feedback
+
+syn match giftGFB "####\_.\{-}\(\_^\|[^\\]\)\ze}" contained contains=giftGF "General feedback block
+syn match giftGF "####\zs\_.\{-}\(\_^\|[^\\]\)\ze}" contained contains=@giftCEF "General feedback
+
+"------------------------------------------------------
+" Answer components: Other components
+
+syn keyword giftTF T TRUE F FALSE contained
+
+syn match giftNum1 "[-+]\=[.0-9]\+" contained "Something matching a number
+
+syn match giftNum2 "[-+]\=[.0-9]\+\s*:\s*[-+]\=[.0-9]\+" contained contains=giftNum2D "Number with error margin
+syn match giftNum2D ":" contained "Associated delimiter
+
+syn match giftNum3 "[-+]\=[.0-9]\+\s*\.\.\s*[-+]\=[.0-9]\+" contained contains=giftNum3D "Number as min/max range
+syn match giftNum3D "\.\." contained "Associated delimiter
+
+syn match giftWeightB "%-*[0-9]\{1,2}\.\?[0-9]*%" contained contains=giftWeight "Weight block
+syn match giftWeight "%\zs-*[0-9]\{1,2}\.\?[0-9]*\ze%" contained "Weight
+
+"-----------------------------------------------------
+" Answer choices
+
+syn match giftWrongNum "\~\zs\_.\{-}\(\_^\|[^\\]\)\ze\(####\|}\)" contained contains=@giftCEFF "Wrong numeric choice
+syn match giftRightNum "=\zs\_.\{-}\(\_^\|[^\\]\)\ze\(=\|\~\|####\|}\)" contained contains=@giftCEFFW,@giftNums "Right numeric choice
+
+syn match giftWrong "\~\zs\_.\{-}\(\_^\|[^\\]\)\ze\(=\|\~\|####\|}\)" contained contains=@giftCEFFW "Wrong choice
+syn match giftRight "=\zs\_.\{-}\(\ze->\|\(\_^\|[^\\]\)\ze\(=\|\~\|####\|}\)\)" contained contains=@giftCEFFW "Right choice
+syn match giftMatchB "->\_.\{-}\(\_^\|[^\\]\)\ze\(=\|\~\|####\|}\)" contained contains=giftMatch "Match choice block
+syn match giftMatch "->\zs\_.\{-}\(\_^\|[^\\]\)\ze\(=\|\~\|####\|}\)" contained contains=@giftCE "Match choice
+
+"----------------------------------------------------
+" Answer
+
+syn match giftAnswer "{\_.\{-}\(\_^\|[^\\]\)}" contained keepend contains=@giftA "General answer
+syn match giftAnswer "{}" contained "Minimal answer
+
+syn match giftAnswerNum "{\_[[:space:]]*#\_[^#]\_.\{-}\(\_^\|[^\\]\)}" contained keepend contains=@giftANum "Numeric answer
+syn match giftAnswerNumD "{\zs\_[[:space:]]*#" contained "Associated delimiter
+
+"---------------------------------------------------
+" Question
+
+" The first pattern matches the last question at the end of the file (in case there is no empty line coming after).
+" However, it slows down parsing (and especially scrolling up), therefore it is commented out.
+
+"syn match giftQuestion "[^{[:space:]]\_.\{-}\%$" keepend contains=@giftCEF,giftAnswer,giftAnswerNum
+ syn match giftQuestion "[^{[:space:]]\_.\{-}\n\(\s*\n\)\+" keepend contains=@giftCEF,giftAnswer,giftAnswerNum
+
+"--------------------------------------------------
+" Question name
+
+syn match giftName "::\_.\{-}::" contains=@giftCE,giftNameD "Question name
+syn match giftNameD "::" contained "Associated delimiter
+
+"-------------------------------------------------
+" Category
+
+syn match giftCategoryB "^\s*\$CATEGORY:.*\n\+" contains=giftCategory "Category block
+syn match giftCategory "^\s*\$CATEGORY:\zs.*\ze\n" contained "Category
+
+"------------------------------------------------
+" Comments (may need to be the last entity)
+
+syn keyword giftTodo FIXME TODO NOTE FIX XXX contained
+
+syn match giftIdB "\[id:\(\\]\|[^][:cntrl:]]\)\+]" contained contains=giftId "Id block
+syn match giftId "\[id:\zs\(\\]\|[^][:cntrl:]]\)\+\ze]" contained "Id
+
+syn match giftTagB "\[tag:\(\\]\|[^]<>`[:cntrl:]]\)\+]" contained contains=giftTag "Tag block
+syn match giftTag "\[tag:\zs\(\\]\|[^]<>`[:cntrl:]]\)\+\ze]" contained "Tag
+
+syn match giftComment "^\s*//.*" contains=giftTodo,giftIdB,giftTagB
+
+"-----------------------------------------------
+" Clusters
+
+"Comments and entities (to be escaped)
+syn cluster giftCE contains=giftComment,giftS,giftES,giftEN,giftH,giftEH
+
+"The above plus format
+syn cluster giftCEF contains=@giftCE,giftFormat
+
+"The above plus feedback block
+syn cluster giftCEFF contains=@giftCEF,giftFB
+
+"The above plus weight block
+syn cluster giftCEFFW contains=@giftCEFF,giftWeightB
+
+"Possible numerical representations
+syn cluster giftNums contains=giftNum1,giftNum2,giftNum3
+
+"Possible contents of answers
+syn cluster giftA contains=giftComment,giftTF,giftWrong,giftRight,giftMatchB,giftFB,giftGFB
+
+"Possible contents of numerical answers
+syn cluster giftANum contains=giftAnswerNumD,giftComment,@giftNums,giftWrongNum,giftRightNum,giftFB,giftGFB
+
+"-----------------------------------------------
+
+let b:current_syntax = "gift"
+
+"-----------------------------------------------
+
+hi Conceal ctermbg=NONE ctermfg=Blue guibg=NONE guifg=Blue
+hi Feedback ctermbg=NONE ctermfg=DarkCyan guibg=NONE guifg=DarkCyan
+hi GFeedback ctermbg=NONE ctermfg=DarkGreen guibg=NONE guifg=DarkGreen
+hi WeightB ctermbg=NONE ctermfg=DarkYellow guibg=NONE guifg=DarkYellow
+
+"-----------------------------------------------
+
+hi def link giftS Error
+hi def link giftES Conceal
+hi def link giftEN Conceal
+hi def link giftFormat LineNr
+
+hi def link giftH Error
+hi def link giftEH Conceal
+
+hi def link giftFB PreProc
+hi def link giftF Feedback
+hi def link giftGFB Title
+hi def link giftGF GFeedback
+
+hi def link giftTF Question
+hi def link giftNum1 Question
+hi def link giftNum2 Question
+hi def link giftNum2D Special
+hi def link giftNum3 Question
+hi def link giftNum3D Special
+hi def link giftWeightB WeightB
+hi def link giftWeight Identifier
+
+hi def link giftWrongNum Constant
+hi def link giftRightNum Question
+hi def link giftWrong Constant
+hi def link giftRight Question
+hi def link giftMatchB ModeMsg
+hi def link giftMatch Constant
+
+hi def link giftAnswer MoreMsg
+hi def link giftAnswerNum MoreMsg
+hi def link giftAnswerNumD Identifier
+
+hi def link giftQuestion Identifier
+
+hi def link giftName PreProc
+hi def link giftNameD Directory
+
+hi def link giftCategoryB LineNr
+hi def link giftCategory Directory
+
+hi def link giftTodo Todo
+hi def link giftIdB LineNr
+hi def link giftId Title
+hi def link giftTagB LineNr
+hi def link giftTag Constant
+hi def link giftComment Comment