dx8 patch

[Ann and Jason Edmeades]

Changelog

- Stancil mapping now works (it helps to actually allocate a stencil buffer)
- Texture mapping corrected if no real texture bound
- Code now detects which opengl extensions are present - To be extended
later
- More debug tracepoints

Just to add a bug thank you for Lucho who has been a really big help with
this particular issue.

Jason
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