[dx9-20] RenderTarget support

[Ann and Jason Edmeades]

This clears out the next blocking part of the d3d9 / wined3d support and has
been a real pain to implement. I think I've got it right now, and it adds
support for render targets but more importantly the beginnings of a front
and back buffer which lots of the code relied upon.

Unfortunately I couldn't get this next step any smaller than the patch
attached....

Major areas still to go - textures and pixel / vertex shader support. I'm
moving onto the textures next...

Changelog

Add render target support, and ensure there is a front and back buffer
created during device creation

Jason

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