keymap, terminal: more keycodes #9810

- input: recognize <kEqual>, <kComma>
- terminal.c: If we need to support function key, a change must be made
  in libvtermkey. Currently, it emulates strictly VT220 terminal, and
  returning numeric value in 'normal' mode is the expected behaviour.

closes #9810

src/nvim/main.c

@@ -551,7 +551,7 @@ int main(int argc, char **argv)
 
   RedrawingDisabled = 0;
   redraw_all_later(NOT_VALID);
-  no_wait_return = FALSE;
+  no_wait_return = false;
 
   // 'autochdir' has been postponed.
   do_autochdir();