Add support for converting and rendering volumetric data in the cdf format. Replace DataConverter by a more general purpose TaskRunner.

Conflicts:
	modules/volume/CMakeLists.txt
	modules/volume/linearlrucache.h
	src/engine/openspaceengine.cpp

data/tasks/default.task

@@ -0,0 +1,3 @@
+return {
+	"kameleonmetadatatojson"
+}