This directory is getting big, let's split the composite.

panda/src/grutil/grutil_composite2.cxx

@@ -0,0 +1,6 @@
+#include "openCVTexture.cxx"
+#include "ffmpegTexture.cxx"
+#include "movieTexture.cxx"
+#include "nodeVertexTransform.cxx"
+#include "pipeOcclusionCullTraverser.cxx"
+#include "rigidBodyCombiner.cxx"