[feat] Add mappable commands for formatting and saving

[Nehliin]

Should be trivial to do the same to the other TypeableCommands but I'm not sure it makes sense for all of the commands. These two were the most important for me personally.

Fixes #852 (partially?)

[Omnikar]

I'm not sure how good of an idea it would be to only make certain typable commands mappable like this, as opposed to creating some sort of implementation that would allow the user to map a key to any typable command (and perhaps allow such a mapping to pass arguments to the command as well).

[Nehliin]

I based it on this comment in the issue: #852 (comment)

[Omnikar]

I based it on this comment in the issue: #852 (comment)

Oh. Well, I think I'm going to have to disagree with that comment. Adding mappable commands which just invoke the typable commands would cause a lot of duplication i.e. having to maintain a function in the cmd module, an entry in the TYPABLE_COMMANDS constant, another function outside the cmd module, and a line in the commands! invocation. And additionally, you wouldn't be able to use the typable commands to their full potential because you wouldn't be able to pass arguments to them. If there were some additional system that automatically allowed the user to, in their keymap configuration, map a key to any typable command invocation, including configuring arguments to pass to the command, I think it would be much better.

[Nehliin]

Yeah I agree I will revisit this when I have time