Bugfix

Serial protocol nows properly calls callback when fullframe
Minor change to protocol definition
SerialProtocol.py improvement

*Now using bytes type
+payload processing (byte stuffing) function for TX
Removed TODO

Already done by defined timeout
Worker.py cleanup

+new function to send command for querying MCU var table
SerialProtocol.py cleanup and commenting
SerialPortHandler write wrapper function
Logger.py improvement

*cleanup
+RX processing function (not done yet)