SCI: Revert "Fixed fading-related bugs #3267956 and #3041738"

This reverts commit bfef0f5a6fabdef5bb42cffd8b078d4511cf2a80.
SCI: Clarify comment
SCI: Further clarify comment
SCI: Minor cleanup

(Thanks waltervn)
HOPKINS: Fix glitch when exiting computer in FBI rooms
SCI: Add signal/fade related CHECKME
WINTERMUTE: added md5 checksums for version 1.1 of Reversion: The Escape
KYRA: Don't restore music volume right after it has faded down

Since the music volume is set in playTrack(), it shouldn't be
necessary to set it back to the default level when a fade out has
been completed.

This change prevents the volume from spiking right before quitting
the game. I hope it doesn't cause regressions.
HOPKINS: Add French Win95 version detection
HOPKINS: Fix glitch in Ocean Maze initialization
GOB: Add another Spanish DOS version of Geisha

As supplied by alestedx in bug report #3610207
HOPKINS: Fix initialization of timers in EventsManager
HOPKINS: Make Hopkins sleep a bit in order to reduce CPU usage
HOPKINS: Renaming some of the remaining graphics methods
HOPKINS: Renamed remaining GraphicsManager methods
HOPKINS: Janitorial: Remove useless line of code
OSX: Fix memory leaks
HOPKINS: Improve readability in DialogsManager
HOPKINS: Move _oldInventoryPosX to DialogsManager, remove a useless variable
HOPKINS: Remove useless object reference in DialogsManager