KeyDisabler: separate disabling hardware navkeys (in button settings) from enabling navbar (in navbar settings)

Change-Id: Ifdc9a18a66e6596adeeeaebe2e1017bb6916f52c
KeyDisabler + navbar toggle: stop double-tapping checkboxes

Change-Id: I5fc7bdb1b8c629fa4b2ec33f97a5f0b88b9c9f8a
Merge remote-tracking branch 'upstream/kk44' into kk44