Fixes #2009: Timer Voice minute call not working for persistent timers

Timers moved to timer.cpp
Added timer overflow protection
Added timer gtests
THt mode now triggers on THR>10%

radio/src/debug.cpp

@@ -285,7 +285,7 @@ const struct TraceElement * getTraceElement(uint16_t idx)
 
 void dumpTraceBuffer()
 {
-  TRACE("Dump of Trace Buffer ("VERS_STR " " DATE_STR " " TIME_STR "):");
+  TRACE("Dump of Trace Buffer (" VERS_STR " " DATE_STR " " TIME_STR "):");
   TRACE("#   Time                     Event  Data");
   for(int n = 0; n < TRACE_BUFFER_LEN; ++n) {
     struct gtm tp;