Added untested pwm code and fixed some bugs

...fortiss.af3.platform.raspberry/trunk/META-INF/MANIFEST.MF

org.fortiss.af3.platform.raspberry/trunk/lib/inc/PWM.h

...fortiss.af3.platform.raspberry/trunk/lib/inc/libmaestro.h

org.fortiss.af3.platform.raspberry/trunk/lib/src/Gamepad.c

org.fortiss.af3.platform.raspberry/trunk/lib/src/PWM.c

...fortiss.af3.platform.raspberry/trunk/lib/src/libmaestro.c

org.fortiss.af3.platform.raspberry/trunk/lib/src/main.c

...raspberry/generator/executable/PWMActuatorExecutable.java

...raspberry/generator/executable/RaspberryPIExecutable.java