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.cpp

@@ -0,0 +1,6 @@
+#include "videorenderworker.h"
+
+VideoRenderWorker::VideoRenderWorker()
+{
+
+}