feat: Make it possible to keybind TypableCommands

[Nehliin]

Fixes: #852

This makes it possible to add keymaps for TypableCommands (including aliases + commands with arguments) in your config.toml like the following example:

[keys.normal]
"space" = { "t" = ":earlier 5 sec", "y" = ":theme default"}
"f"  = ":format"
"C-s" = ":w"
# Previously mapped "static commands"
"C-l" = "jump_view_right"
"C-h" = "jump_view_left"
"C-j" = "jump_view_down"
"C-k" = "jump_view_up"

This solution is a lot less hacky than my previous pr and makes it possible to map all current and future TypableCommands. I decided to not go for the [ .. ] surround for command arguments because it would just be more of a hassle to parse with little benefit for users imo. Arguments are passed by space separating them after the initial command instead.

Update: aliases are supported as well so updated the example

[Nehliin]

Rebased updated PartialEq implementation and reverted to compositor::Context now. Also I really want to break out Typable, Mappable and Static commands to their own files. At least the long hard coded command lists because the current command file is >5000 loc and a bit annoying to work with. But I can do that in a follow up pr.

[archseer]

Yeah, I've been wanting to do this for a while but it will break pending PRs in the queue. Let's wait until I manage to catch up with the merges.

[Nehliin]

@archseer Sure, like I said I don't want to do that in this pr since that would make it quite huge. Better to do it in a separate pr imo

[archseer]

LGTM but I'd like to get an approval from @sudormrfbin too :)

[sudormrfbin]

LGTM ! Great work @Nehliin 🎉