patch 8.0.1077: no debugger making use of the terminal window

Problem:    No debugger making use of the terminal window.
Solution:   Add the term debugger plugin.  So far only displays the current
            line when stopped.
diff --git a/Filelist b/Filelist
index 594b335..0587917 100644
--- a/Filelist
+++ b/Filelist
@@ -638,6 +638,7 @@
 		runtime/pack/dist/opt/matchit/doc/tags \
 		runtime/pack/dist/opt/shellmenu/plugin/shellmenu.vim \
 		runtime/pack/dist/opt/swapmouse/plugin/swapmouse.vim \
+		runtime/pack/dist/opt/termdebug/plugin/termdebug.vim \
 
 # runtime files for all distributions without CR-NL translation
 RT_ALL_BIN =	\