bug fix, RSSI and A2 working, introduced Telemetry Check Interval

- fixed a bug with Calibration of analog pins within setup()
intitialization.
- successfully tested RSSI and A2 Telemetry voltage
- introduced config parameter "g_Telemetry_Check_Interval" that allows
to define intervals in milliseconds to check telemetry values and TX
voltage. default=3000. typical settings would be 3000-10000