Add support for Dedicated Hardware PTT buttons

Tim Dring requested to merge tdring/mumla:master into master

These changes add support for Dedicated Hardware PTT buttons that utilise Android PTT intents. Captured by the App via Broadcast Receivers, the PTT button is captured with the App open, Minimised, or with the screen off.

The PTT button is only captured if the transmit method is set to Push To Talk in the settings.

This has been excusivliy tested, and confirmed working, on the Alps F40 handset

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