Make sticky modifiers an option, off by default.

Users with near-full-size keyboards (tablet docks/cases, or usb/bluetooth
keyboards) probably don't want sticky modifier keys. Make it an option
that's off by default (except on the Dream where it's likely desirable).
Also, include a third state to make only "alt" sticky, for the benefit of
the crazy keyboard driver on the TF101/201 that doesn't emit real key
events for alt+key pressed together.

Also, implement stickiness for the control key on physical keyboards that
have one, for consistency.

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