MinSG export: Fix bug: References to States could be placed before the State definition.
Improve naming: NodeDescription --> DescriptionMap; NodeDescriptionList --> DescriptionArray; minor code cleanups.
Fix compile
VoxelWorld: Add basic material support.
VoxelWorld: Add material names.
Adapt to changes in Util::Color.
Merge branch 'master' of https://github.com/PADrend/MinSG
first buggy but running edge filtering via GPU
new node generation algorithm