Make audio work platform-independently

[hellerve]

Due to a not-compliant Audio IO processor, all sound-related things only work in Windows. This has to be fixed asap.

[hellerve]

@Tobsic is maintaining the problematic code, so I will assign him.

[hellerve]

Handling and receiving audio works! Wonderful!

[hellerve]

The PySoundGenerator thread seems to be working at least partially, although cleaning up and all related stuff isn't working yet. So what is left to do there?

1. There has to be a method to stop the execution of the thread; atm it just dies - not cool.
2. The AudioOutputProcessor doesn't update its' state(or possibly: the Python thread is not receiving it) under some circumstances; i'll check that.
3. It seems a bit slow to me; that could be either AudioPython or Qt; i'll look into that as well.

I. Update: The thread does not just die anymore - but is only closed when closing the editor.