Yet another update to V3 firmware

Firmware updates could be a chore, but it's almost impossible to have one bug free :) In this update several annoying bugs were squished and one small new feature added.  I feel like this one has fixed all the "known" issues, so I'm taking V3 out of Beta and using in from now on in all Xronos 2 clocks.  V2 is no longer supported or updated, so please upgrade to V3 if you can. Fixes: Fixed Alarm announcement not working when pressing Talk Button Fixed RF indicator and RF statistics (for RFM12b version) Fixed incorrect RF frequency