Prepare for vertices

Port skinned mesh to modern style vertices

WIP

Possible fix

Switch skinned mesh rendering to GPU indexed vertex blending

Fix environment colors

Fix validation completely

Fix light node

Fix environment tag position

Fix userData

Fix userData

Fix light import

Add forgotten imports to scene

Fix copy and merge

WIP

Fix

WIP

Fix

Fix

Fix scene export

Scn import

Extract read_object

Move TightType to dataobjects.py

Add read_light

Extract read_point

Move scene processing to correct place

Organize imports

Add forgotten if

Refactoring