EMI: Implement screenshot thumbnails for savegames
GRAPHICS: Initialize/Destroy _storedDisplay
EMI: Free materials as soon as they are no longer in use by any costumes.
Merge pull request #954 from chkr-private/savegame-screenshots

EMI: Implement screenshot thumbnails for savegames
Merge pull request #967 from Akz-/emi-fix-savecrash

EMI: Free materials as soon as they are no longer in use by any costumes
LUA: Make userdata print out a hex value like EMI.
EMI: Fix compiler warnings for specialty texture ID.
Merge pull request #970 from JoseJX/FixUnsignedIntegerComparison

EMI: Fix compiler warnings for specialty texture ID.
EMI/GRIM: Remove unsused roll parameter from setupCamera calls.
GRIM/EMI: Rename setupCamera to better describe what it does.
Merge pull request #971 from JoseJX/CleanupSetupCamera

EMI/GRIM: Make the setupCamera function more clear
EMI: Add the alpha channel to the color encoding.
Merge pull request #969 from JoseJX/MakeTheColorMatch

EMI: Make the actor ID for Colors match the retail version.
GRIM: fixed compilation error
SDL: added support for SDL2
SDL2: added support for mdvc
SDL2: revert makefile enable SDL2 to original. added instead disabling SDL audio in source code to be compatible with MSVC
SDL2: changed way how to deal with forbidden symbols
SDL2: added comment to SDL win32
SDL2: use dynamic cast