EMI: Use half-transparent plane to implement dimScreen (OpenGL)

- instead of re-calculating the color values when dimming the screen,
  better draw a half-transparent plane after drawing all non-overworld
  characters
- fixes the issue that overworld actors were dimmed and that the
  pause screen is transparent when the inventory is open
EMI: Use half-transparent plane to implement dimScreen (TinyGL)

- instead of re-calculating the color values when dimming the screen,
  better draw a half-transparent plane after drawing all non-overworld
  characters
- fixes the issue that overworld actors were dimmed and that the
  pause screen is transparent when the inventory is open
DEBIAN: fixed build package
EMI: Use half-transparent plane to implement dimScreen (OpenGLS)

- instead of re-calculating the color values when dimming the screen,
  better draw a half-transparent plane after drawing all non-overworld
  characters
- fixes the issue that overworld actors were dimmed and that the
  pause screen is transparent when the inventory is open
Merge pull request #965 from chkr-private/screen-dim-fixes

Use half-transparent plane to implement dimScreen in EMI
AmigaOS: Add and make use of a new drawer icon

This PR is missing the actual binary icon files...they'll be added later
Merge pull request #1094 from raziel-/patch-1

AmigaOS: Add and make use of a new drawer icon
AMIGAOS4: added drawer icon
GRIM/EMI: Call glViewport for apitrace compatibility

glViewport needs to be called once to avoid the apitrace
error: "could not infer drawable size (glViewport never called)".

This fixes the problem that all apitrace framebuffer pictures
had a default size of 32x32 instead of the correct resolution used
in residualvm.
GRIM/EMI: Use the correct setUniform function for "alphaRef"
Merge pull request #1095 from chkr-private/apitrace-fixes

GRAPHICS: OpenGLS bug fixes
MYST3: Properly reset the movie scripts
COMMON: Add the original Xbox to the list of platforms
MYST3: Add detection for the Xbox PAL version
MYST3: Look for wma sound files

Used by the Xbox version. Playing wma files is not supported for now
MYST3: Don't hardcode opcode indices
MYST3: Opcodes are slightly different of the xbox version
MYST3: Load the language archives for the xbox version
MYST3: Refactor subtitles handling to allow different kinds of subtitles
MYST3: Add support for the xbox movie based subtitles