feat(edit): insert an unsimplified key using CTRL-SHIFT-V

This marks the following Vim patches as ported:

vim-patch:8.1.2333: with modifyOtherKeys CTRL-^ doesn't work

Problem:    With modifyOtherKeys CTRL-^ doesn't work.
Solution:   Handle the exception.
https://github.com/vim/vim/commit/828ffd596394f714270a01a55fc3f949a8bd9b35

vim-patch:8.1.2350: other text for CTRL-V in Insert mode with modifyOtherKeys

Problem:    Other text for CTRL-V in Insert mode with modifyOtherKeys.
Solution:   Convert the Escape sequence back to key as if modifyOtherKeys is
            not set, and use CTRL-SHIFT-V to get the Escape sequence itself.
            (closes vim/vim#5254)
https://github.com/vim/vim/commit/fc4ea2a72d36de1196a3ce17352e72f8fe90f4bb

vim-patch:8.2.2084: CTRL-V U doesn't work to enter a Unicode character

Problem:    CTRL-V U doesn't work to enter a Unicode character when
            modifyOtherKeys is effective. (Ken Takata)
Solution:   Add a flag to get_literal() for the shift key. (closes vim/vim#7413)
https://github.com/vim/vim/commit/0684e36a7ee0743f2889698fb8e0e14f7acae423

Omit getcmdkeycmd() change as it depends on Vim patch 8.2.2062, which
may introduce a potential breakage.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/nvim/normal.c b/src/nvim/normal.c
index ed5f13d00a..73ea995d8f 100644
--- a/src/nvim/normal.c
+++ b/src/nvim/normal.c
@@ -5154,7 +5154,7 @@ static void nv_replace(cmdarg_T *cap)
   // get another character
   if (cap->nchar == Ctrl_V) {
     had_ctrl_v = Ctrl_V;
-    cap->nchar = get_literal();
+    cap->nchar = get_literal(false);
     // Don't redo a multibyte character with CTRL-V.
     if (cap->nchar > DEL) {
       had_ctrl_v = NUL;
@@ -5369,7 +5369,7 @@ static void nv_vreplace(cmdarg_T *cap)
       emsg(_(e_modifiable));
     } else {
       if (cap->extra_char == Ctrl_V) {          // get another character
-        cap->extra_char = get_literal();
+        cap->extra_char = get_literal(false);
       }
       stuffcharReadbuff(cap->extra_char);
       stuffcharReadbuff(ESC);