Minor update to RotaryEncoder in encoder.py part (fix shutdown code)

Add axis names and button names to Joystick.

Fixes issue where images come out as BGR instead of RGB for Jeston Nano

Detect loading of unrecognised model file types.

Add 'else' clause to loading model files to capture unknown file extension types (i.e. NOT .h5 or .json)

* This makes controlling the car with the triggers intuitive.
* Right trigger to accelerate.
* Left trigger to decelerate.

* This step helps discover mappings not already pre-existing and
provides a way to dicover and modify defaults.

* Adds Forza mode for the XboxOne controller.

Fix training split (issue 406)

Reintroduce the much improved Calibrate function

Does not have 10-loop limit, provides interactive method to exit from utility.

Fix tubplot to NOT provide its own default model type.