log error cause of fbus protocol
introduced retry count for SMS sending
dump input frame to debug out on fbus error
separated waiting for gsm network from mobile power on code to support
retry if offline without turning phone off.
removed old debounce code
fixed small issue, led pin should be declared as bitmask
implemented trigger support in timer module, buzzer is using timer
module for asynchronous operation
implemented blocking function which waits for asynchronous transmission
added blocking function which waits for all timers to finish
Implemented mode switch key
Changed mode switch pin to PCINT23
Fixed bugs in mode switch module: Removed sleep mode for bugfixing,
implemented toggle between mode 0 and mode 1, clear PCI flag before
enabling watchdog, enable pull up before enabling interrupt, removed
debug output because it may block