[feat] Adapt code for play / pause Python binding

Feature:

• Add PythonQT decorator on lqPlayerControlsToolbar to be able to initiate it in applogic code.
• Add onPause and onPlay PythonQT decorator (Note: when the onPlay() is used on reader mode it will block any futher interaction with the python shell)

Style:

• Update style on concerned files with clang-format

Please merge !357 (merged) first