patch 8.0.0210: no support for bracketed paste

Problem:    Vim does not support bracketed paste, as implemented by xterm and
            other terminals.
Solution:   Add t_BE, t_BD, t_PS and t_PE.
diff --git a/src/misc2.c b/src/misc2.c
index c26f900..bf98a64 100644
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -2294,6 +2294,8 @@
     {K_XDOWN,		(char_u *)"xDown"},
     {K_XLEFT,		(char_u *)"xLeft"},
     {K_XRIGHT,		(char_u *)"xRight"},
+    {K_PS,		(char_u *)"PasteStart"},
+    {K_PE,		(char_u *)"PasteEnd"},
 
     {K_F1,		(char_u *)"F1"},
     {K_F2,		(char_u *)"F2"},