Added SCE_VOctree_{Set,Get}NodeData() functions
Added SCE_VWorld_GetTree() function: get a tree from its absolute coordinates
SCE_VWorld_Load() no longer loads any octree, use SCE_VWorld_LoadTree()
and SCE_VWorld_LoadAllTrees() instead.
SCE_VWorld_Save() no longer saves any octree, use SCE_VWorld_SaveTree()
and SCE_VWorld_SaveAllTrees() instead.
Added the following functions to SCEVoxelOctree module:
  SCE_VOctree_GetNodeFilename
  SCE_VOctree_GetNodeStatus
  SCE_VOctree_GetNodeLevel
  SCE_VOctree_GetNodeOriginv
  SCE_VOctree_GetDimensionsv
  SCE_VOctree_GetNumNodes
SCE_VOctree_SyncNode() now public
SCE_VOctree_CacheNode() now public
SCE_VOctree_UpdateCache() now can fail, and thus returns an integer
Added SCE_VOctree_Fetch*() functions that replace SCE_VOctree_GetNode()
Added SCE_VOctree_GetNodeCompressedSize() and SCE_VOctree_GetNodeCompressedData()
Added a bunch of small useful (trust me) functions in SCEVoxelWorld module
Removed some unused variables in SCE_VWorld_Load()
SCE_VWorld_UpdateCache() now can fail, and thus returns an integer (deja vu commit)
Added SCE_VWorld_Fetch*() functions
Added "free" function callbacks for VOctree and VOctree nodes