- updated platform.hpp to allow DLL_EXPORT
- necessary to change unique_ptr<> to raw pointer in renderer.hpp/cpp
- cmake improvements for windows
- added composite stage
- introduced enums for pipeline stages
- composite pass now inherits from geometrypass to render volumeproxygeometries
extended scenegraph with volumenodes
extended compositePass with volume proxy rendering
Merge branch 'develop' of https://github.com/vrsys/guacamole into windows_port