Add an insert escape map

C-[ requires a pinky stretch and escape moves my hand off the homerow.
Try a map that's not used by anything else and is close to homerow.
Make vim spelling map local to buffer

Otherwise turning this off and on seems to have ugly effects
with filetypes that modify the setting too.
sub: Update itchy and use plug maps

Use new plug mappings. No functional change.

Also fixes filetype issue.
sub: use autoloaded itchy
Add map for CtrlPSameName

Convenient for finding inl (since I do not cycle related files).
Add PVRevisionGraph
Use p4vc where possible

p4vc is a new exe that provides official support for
opening gui components from the command line.
sub: Do not use ^M in ripple