Use entrain flag in EntrainAudio to decide to morph or not

The EntrainAudio message now has a flag that tells us whether or not we
should actually entrain the provided audio file, or whether we should
just generate energy for it, and stream it, the energy, and visemes
without entrainment.

package.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0"?>
 <package>
   <name>rr_audio_entrainer</name>
-  <version>1.0.0</version>
+  <version>1.2.0</version>
   <description>Entrain audio files to match target audio</description>
 
   <maintainer email="[email protected]">jakory</maintainer>