Add option to ignore specific first responder classes for keyboard shortcuts

[PoeticPete]

There are instances where a view will be first responder, but we still want to allow keyboard shortcuts.

This change adds an ignore-list for allowing FLEX keyboard shortcuts even if there is a first responder on the given classes.

[NSExceptional]

Why the simulator specific language? I don't think these are specific to the simulator, are they? Do they not also work when you have a bluetooth keyboard connected to the device?

(If they are simulator-only, we need to add some /// comments to this class to reflect that)

[PoeticPete]

Why the simulator specific language? I don't think these are specific to the simulator, are they? Do they not also work when you have a bluetooth keyboard connected to the device?

(If they are simulator-only, we need to add some /// comments to this class to reflect that)

This logic indeed simulator specific. See registerSimulatorShortcutWithKey for more context.

The comments above the new methods already mention simulator. The entire Classes/Utility/Keyboard/FLEXKeyboardShortcutManager.m is already gated to simulators only. Is the request to add comments at the top of FLEXKeyboardShortcutManager.h? That feels a little beyond the scope of this PR, but I'd be happy to publish a new one addressing that.

[NSExceptional]

My bad! No, sorry, I just haven't touched this code in a long while so I wasn't sure