Pupil Capture and Player incremental release

This a an incremental release of Pupil Capture for Linux and MacOS and Pupil Player for Linux

• Shader based color conversion saves 30% CPU time in the world process.
• Audio Capture has been properly implemented for Mac and Linux
• Video Capture has been optimised to reduce CPU load when using more CPU smaller file setting.
• Various smaller fixes
• All media file IO is done with PyAV