Keybindings functions

[elferherrera]

Simplifying the keybinding functions and correcting default keybindings

[fdncred]

is this working right? I only have 1 keybinding for vi_normal.

[sholderbach]

The vi normal mode parser is handwritten and not available as a mapping. Q how we want to document it. Exposing it to configuration is definitely non trivial

[fdncred]

@sholderbach is there no way vi_normal can be more keybind-y? I'm looking at edit_mode/vi/commands.rs parse_command() and a lot of that looks like keybindings. But maybe these shouldn't be changeable. I mean, having a thing in vi mode means it will work like vi where $ moves to the end, etc. so, maybe we should just leave some things hard-coded here.