acme-esque mouse button support

[myitcv]

Acme's configurable support for the three mouse buttons is brilliant. Write a plugin to emulate this in (terminal) Neovim.

• Button 1 select
• Button 2 execute (context dependent)
• Button 3 open or search (context dependent)

Chords for cut and paste etc

[myitcv]

@fmoralesc - FYI

[fmoralesc]

@myitcv Will try to adapt my plan9-for-vimspace plugin to neovim. There shouldn't be many issues. Current vim implementation doesn't make it easy to emulate all the things, though, because we need multiple selections to emulate chords.

[myitcv]

@fmoralesc - will certainly consult you on plan9-for-vimspace before progressing with this idea.