Convert Edit menu accelerators (hotkeys) to custom system (#38)

Same idea as 0b75561333f1809fae2ed3365954a4a64119ca9b
Convert Image and Select menu accelerators (hotkeys) to custom system

(#38)

See 0b75561333f1809fae2ed3365954a4a64119ca9b for details.
Move all remaining menu accelerators (hotkeys) to custom system

Fixes #38.  Good riddance!