Audio capture previously needed an additional class, however there is no need for this if this can be done together with the actual obs::source object. So obs::source now has a new audio_data event that can be listened to, which handles capturing audio data if requested.
Additionally all other events are now selectively listened to, instead of permanently listening to them. This should drastically reduce the overhead of using obs::source.
The number of files in the source directory was a little bit much and just made file naming more complex than it had to be. Therefore all files were moved into subdirectories where it matters.
Filters now reside in source/filters/, Sources in source/sources/, OBS Wrappers in obs/, OBS GS Wrappers in obs/gs/, Transitions will reside in source/transitions, Graphics Helpers will be in gfx/.
