GRAPHICS: Use glClientActiveTextureARB to lower required API to GL1.2.
DOCS: Add Sergej Forat to the contributors list
DISTS: Update another year to 2013
BUILD: Use proper OpenAL includes on OS X
GRAPHICS: Move vertex/index state into Vertex/IndexBuffer.
GRAPHICS: Fix NWN2 model textures

Regression introduced in ca05ff3.