SCI32: Improve kShowMovieWin (AVI) rendering

1. Added a new game option for linear interpolation when scaling
   video in ScummVM builds with USE_RGB_COLOR;
2. 8bpp videos that put black in a palette index other than 0
   (KQ7) should now always render correctly without the earlier
   game-specific workarounds which did not work very well;
3. Data from game scripts regarding video size and position are
   now ignored, since games always just try to show videos in the
   middle of the screen, but frequently get this a little bit
   wrong, causing either bad aspect ratios or off-center videos;
4. Builds without USE_RGB_COLOR support will not crash when
   attempting to play >8bpp AVIs, like those from KQ7 2.00b.

Fixes Trac#9843, Trac#9762.

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