pitchscreen make it a plugin

full commandline parsing
    -has pitch, speed, time_stretch
 /* pitch_screen
 *  accepts args -q, -g, -p=, -s=, -k=; (= sign is optional)
 * -q silences output splash
 * -g runs the gui (Runs immediately)
 * -p100 would set pitch to 100%
 * -s=90 sets speed to 90% if timestrech is enabled
 * -k=true -k1 enables time stretch -k0 -kf-kn disables
*/

Change-Id: I900c4b5d184e12ddbe47509f66fdf3e55193a520

apps/plugins/SOURCES

@@ -48,6 +48,10 @@ lamp.c
 pitch_detector.c
 #endif
 
+#ifdef HAVE_PITCHCONTROL
+pitch_screen.c
+#endif
+
 mp3_encoder.c
 wav2wv.c