Terrain work:
- Convert CPU-side data to GPU buffers in Terrain::load
- Make sure vertex data is assigned only after the full tree has been built
- Flip image data on import
- Many bugfixes in TerrainQuadTreeNode - several pointer arithmetic errors (float pointers being used with getVertexSize()), some LOD / depth issues
- Remove terrain.png from PCZAppMedia - this confused the hell out of me since the name is the same as the primary terrain test, except the data is zeroed out around the edge so I thought I had a bug!
git-svn-id: https://svn.ogre3d.org/svnroot/ogre/trunk@8583 8631bf8a-c64b-0410-883c-f3eb003322f7