The following changes have been made:
- config changes in IrrCompileConfig.h
- primary sort by material type
- stencil RTT support
- drawall types
- materialtype override
- skies respect Z
- partial backport to expose setCurrentRendertime in the scene mgr (upstream)
- a workaround for every other RTTs flipping
- aabbox intersection support (upstream)
- texture override
- non-triangle VBO support
- extension order mismatch
- support for some RG texture formats
