1/3 winex11: add PixelFormat supports for palettes

[Roderick Colenbrander]

Hi,

This patch is part of a series of patches which will add PixelFormat
support to the palette code. The goal is to get rid of a hardcoded
PixelFormat in X11DRV_PALETTE_ToPhysical / _ToLogical in order to
prepare for 32-bit dibsection support.

This first patch introduces a PixelFormat structure and lets the
current code use it. For now I'm doing something like 'PixelFormat *pf
= &default_format' in the ToLogical/ToPhysical functions but that will
be removed in patch 2 and 3, it is just a temporary line of code, so I
could keep this patch small.

Regards,
Roderick Colenbrander
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