Pause hotkey handling

[timnyborg]

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[X] Feature request
[ ] Documentation issue or request
[ ] Support request
[ ] Other... Please describe:

Current behavior

It is impossible (?) to temporarily disable the handling of hotkeys.

Expected behavior

Run hotkeysService.pause() to temporarily interrupt the handling of hotkeys, and .unpause() to resume handling.

What is the motivation / use case for changing the behavior?

When I display modals in my application, I want to prevent any hotkeys until they are dismissed.
It's a simple change, so I'm happy to put together a PR if the functionality would be welcome.

[NetanelBasal]

You're welcome to submit a PR

[Tweniee]

@NetanelBasal is this feature implemented or open? attempt/#62