Add macro recording with q<register>/q.

[Shadowfiend]

A few things had to be done for this:

• A new map flag, ViMapNoArgumentOnToggle, intended to be used in conjunction with ViMapNeedArgument. This makes it so that every other invocation of the given mapping acts as if ViMapNeedArgument is unset.
• Some additional variables to keep track of the last toggle command (for the above to work) and the ViKeyManager that is currently recording a macro (so it can get key codes from all key managers; this lets the macro record, for example, commands from the command key manager when macro recording is invoked from normal mode).

There are some issues with more complex macros, and I'm not sure if those are issues with the macro recording itself (the register seems to contain the key strokes) or if it's an issue with replaying macros that are a little more complicated.

I'm also not sure this is necessarily the best way to implement it. Definitely looking for some feedback on that front.

[martinh]

Cool stuff. If the macro state moved to ViParser, I think we can manage recording macros over multiple documents and multiple views of the same document. As it is now, you can't start a macro in one document and end it in another.

[Shadowfiend]

Aha! Fair point. I'll work on that later today and update the PR.

[Shadowfiend]

Ok, finally got around to toying with this. I'm confused about one thing though: given that the key manager that is currently recording the macro is stored in a static global variable, why wouldn't it record over multiple documents and views?

[Shadowfiend]

This should now be in master since I merged my merged branch in.