Feature branch: IMPORTANT connection+telemetry+table fixes and improvements

[artem30801]

• Fixed dublicate rows in table
• Fixed removal of copters from table (hopefully, that's all)
• Refactored telemetry for better performanse, usability and readability
• Refactored display and formatting data in table: storing and checking raw data, displaying fancy formatted text
• Improvemant of notifier mechanism for NO delay and compability of local testing
• Some slight improvemants in codestyle
• Added traceback for PYQT5 debugging (yay!)

[goldarte]

Tested it quickly with getting telemetry - it works, but needs flying tests to test again client's failsafe functions.