Added BindTexture, GetTextureDimensions, UnBindTexture.
Proper GetContainer support for surface.
SetContainer added to surface and volume.
SetInPbufferState added to surface (until gl context management is
implemented).
Minor changes:
- BaseTexture no longer 'holds' a reference to IWineD3DDevice to
  prevent circular referencing.
- Better managment of referinging for texture.
- Some TODO's for implementing a context manager.
- Better preload implementation.
- Fix compile warning in device.c Set/GetSamplerState.
- Add QueryInterface support for surface.
- Format X8R8G8B8 added to locking.