Wielded fixes. Add shaders support.
Add Generator Element Management framework

Add BiomeManager, OreManager, DecorationManager, and SchematicManager
Add eased 3d point-value noise functions
Mapgen v7: Fix uninitialized spflags
Mapgen v5: Fix minor style issue
Fix compilation under some Linux distributions
Remove most exceptions from getNode() (and variants)
Merge branch 'master' into mygame
Merge branch 'getnode_exception_free' into mygame

Conflicts:
	src/game.cpp
	src/localplayer.cpp
	src/map.cpp
	src/mapblock.cpp
	src/mapblock.h