Introduce first cut of live shifter

ladspa-lv2/libmain-lv2.cpp

@@ -25,6 +25,7 @@
 #undef RB_PLUGIN_LADSPA
 #include "RubberBandPitchShifter.cpp"
 #include "RubberBandR3PitchShifter.cpp"
+#include "RubberBandLivePitchShifter.cpp"
 
 #include <stdio.h>
 
@@ -35,8 +36,10 @@ const LV2_Descriptor *lv2_descriptor(uint32_t index)
 {
     if (index < 2) {
         return RubberBandPitchShifter::getDescriptor(index);
-    } else {
+    } else if (index < 4) {
         return RubberBandR3PitchShifter::getDescriptor(index - 2);
+    } else {
+        return RubberBandLivePitchShifter::getDescriptor(index - 4);
     }
 }