This will hopefully help deal with a particular issue where the program
may go to sleep if it hasn't received input from the user for long
periods, or if a game is running in fullscreen mode apparently.

OBS should not run as agent app

The bundle icon now includes all recommended image resolutions and OBS
is now started as high resoltion application for high dpi displays,
still need to add high resolution images for icons used inside OBS

CMake now works on all platforms