Add init_ressources method.
Fix spelling.
Move load screen functionality into extra method.
Refactor serialization into extra method.
Add serialize helper method.
Remove call_serialize method.
Explicitly pass SceneGraph to serialize method.
Explicitly pass pointer to current SceneGraph.
removed necessity for videodatabase
moved video3d dafult material to ressources
- ubershader aggregates shaderprograms instead of inheriting them
Merge branch 'develop' of https://github.com/vrsys/guacamole into feature/video3d

Conflicts:
	include/gua/renderer/GBufferPass.hpp
	src/gua/renderer/ShadowMap.cpp
Merge pull request #30 from scholli/feature/video3d

Feature/video3d