- inputs changed
	- VisualLayer take ofImage
	- Mixer take ofTexture (so FBOs can be used as input source as well)
- resolution of input sources can be set in code (ImageOutput.h), bigger then 640x480 results in low framerate
- ParticleGenerator as InputSource added
	- Outputs only textures, no ofImage, can only be processed by mixers
- Minor changes to keep the Inputs flexible