`unmapAll` as a Command / Binding

[innateessence]

Use-case:

It'd be nice to be able to map ZZ in insert mode to unmapAll for whenever I'm doing code challenges that have an online IDE.

Problem statement

I instinctively press "Esc" to exit insert mode in the editor, which puts vimium in normal mode but leaves the online IDE in insert mode and is a frustrating thing to experience.

I'm sure there are other use-cases for this as well, I may end up submitting a PR if people agree this is a good idea.

Work around

For now, I'll just set vimium to ignore the URL where those online IDEs are relevant, which is good enough, but not ideal imo.

Rationale

'ZZ' - essentially an alias to :q in vim. (seeing as how x is actually 'exit-tab', ZZ makes a lot of sense)

Considerations

If I make a PR, I might make it a default binding, or perhaps just a Command that a user can use as a custom binding. Might be a good idea to get some input

[gdh1995]

You may try my customized version of Vimium, named Vimium C (https://github.com/gdh1995/vimium-c), and I've added a special option of "Compatibility of Escape", and it's a list of CSS selectors:

• When you press Escape when a CSS-matched element is focused, then Vimium C won't suppress the Escape keydown event, so that web pages will also receive the event and respond on it.