layout:
./
./app 		: the whole application
./app/HRIR	: HRTF-soundfiles
./app/engine	: the audio-engine
./app/gui	: all gem-related objects
./app/gui/data	: models,...
./app/control	: input: mouse, joystick, midi
./app/*		: glue

./app/externs	: needed libraries (binaries)
./app/abs	: needed abstractions
./app/iemabs	: IEMabs (?)
./app/*		: glue...

