stateset refactoring: now statesets can be added onto any GroupNode.
big refactoring and cleanup of shaders
moved a bunch of methods into ReferencedStateSet (to be adopted by derived classes), like setLighting, setRenderBin, setTextureRepeat, setTextureBlend
Recent doc additions
More fixes towards a spin namespace
Re-generated the wrappers
renamed to <cppintrospection> in wrapper stuff
Removed genwrapper from the source tree (it is now an external dependency). Also added all the necessary (pre-generated) osgWrappers so that building wrappers is only required by the developer who makes a change to the API (header files).