Add keybindings for common editor features

[TeamDman]

Currently, SFM has keybinds like ctrl+c and ctrl+/ and \ for accepting intellisense suggestions. Might be good to detach keybinds from actions, add a command palette, and add key bindings to bind to actions.

Probably want a pretty sophisticated binding UI. If we use the MC binding, we will create a lot and will be noisy when adding a lot of keyboard shortcuts that only are active in an editor screen, so perhaps best to isolate?