3/2 wined3d: move palette uploading code over to blit_shader [attempt 2]

[Roderick Colenbrander]

Hi,

This version contains a lot of improvements:
- got rid of width/height and other parameters in set_shader because
they are unneeded
- added DECLSPEC_HIDDEN for the init palette call
- got rid of unneeded context code in RealizePalette
- added a comment that upload_palette requires a context
- fixed glBindTexture bug in upload_palette

Further to answer 'Also, what happens to any previous textures bound
on that unit?' this is taken care of by the caller (it sets up a
context for blitting).

Roderick
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