[dx8-16] Various bits

[Ann and Jason Edmeades]

Apologies these are all one patch not split out - I had internet problems
and
just kept going. If it is a problem let me know, and all this is based off
todays
CVS without including Raphaels patches.

Changelog

o Move texture loading into PreLoad for 2D textures (needs doing for
        the others as well), and call when needed as well
o Change D3DFMT_R5G6B5 handling to make backdrop of Max Payne appear
o Add code to reject attempts to use invalid texture units (Max Payne did
this a lot)
o ValidateDevice fixme silenced as harmless but occurs frequently
o Add trace which can be compiled in to debug vertex shaders, and correct
       fixmes and dprintf's into appropriate trace statements
o Ensure we trace what we return when querying the device caps
o Correct bug with negative numbers in vertex shader code

Jason
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