Moved old online example code to its own folder; it is intact there to remain as an example of old serial comm prototyping.

The SerialCommunicator.py file has the following updates:
- Separated functionality of singleton class to its own file (now imported)
- Starting building debug functionality (very basic still)
- Updated to follow new scheme of serial comm including unique ID
- Working on unit tests for move and read. Note that I am leaving mvoe functionality in in case we go back to using the Arduino for PWM