added initial config file stuff, set up a 'dummy' window to cause the graphics system to persist through window changes

cleaned up main internal data structure design, changed to reference counting for sources to ensure safe destruction of source objects from all parts of the system, added some service-related stuff for testing

added VAOs to vertex buffers (might need some future tweaking to check whether buffers are already assigned to specific attributes)

make code gl-cocoa.m 80 columns for consistency (I'm probably just being OCD, don't mind me, hopefully didn't break anything)

Compilation fails with wxWidgets below version 2.9.0

added support for jansson, added new output files, made some adjustments to the API, fixed a UI subclass issue