worked through new renderer worker annd split it off into gl and non-gl

specific code

The new rendering system is now starting to work as planned, however it is
still not as complete as the iteration before. But this should be a more
robust design moving forward. Work was also done towards splitting off all
OpenGL-specific worker code into a derived class. The hope is to have no
hard dependency on OpenGL and make swapping it out with other backends
straight-forward.

app/render/backend/videorenderworker.h

@@ -0,0 +1,11 @@
+#ifndef VIDEORENDERWORKER_H
+#define VIDEORENDERWORKER_H
+
+
+class VideoRenderWorker
+{
+public:
+  VideoRenderWorker();
+};
+
+#endif // VIDEORENDERWORKER_H