- add AudioEffectDescription to let the user select available effects
-> add necessary methods to Backend(Capabilities)
- AudioEffect ctor now takes an AudioEffectDescription object to select the
effect
-> cannot make use of macros in phonondefs anymore, let's just hope the
pattern doesn't have to change again
- adapt fake backend and make effects more modular (I'm feeling the urge to
implement a real backend instead of a fake one... have to resist)
-> anyway the AbstractMediaProducer creates a 4 octave sweep with a sine
wave now which can be processed by a delay effect (with time,feedback and
level controls) and then dumped into /dev/dsp :)