SCI: Revert "Add a hack to fix bug #3596335"

This reverts commit f019d5a4881c8ee42fa36ef0613d9e82b3b36297.
SCI: Revert "Properly fix bugs #3267956 and #3605377"

This reverts commit 17ca8d14b1e0d1960485029878c728ef4d6d6132,
except for a minor unrelated change to the workaround for bug #3605269

Conflicts:
	engines/sci/sound/soundcmd.cpp
SCI: Revert "Fix script bug #3555404 - "SCI: KQ6 Spider Scene Game Freeze""

This reverts commit 8524ebd699254a6786033f0e41b9a45c563feb11.
SCI: Revert "Clarify comment from rev 5654e12 further"

This reverts commit 9f74a6eda2355bb09b9b963be41509ed67016a6c.
SCI: Revert "Added a more specific workaround for bug #3267956.[...]"

This reverts commit 5654e1257551bf176c7fd06c756612bec3d79033.

Conflicts:
	engines/sci/sound/soundcmd.cpp
SCI: Notify scripts of completed fade when aborting it

This tweaks a fix/workaround (commit 96540686) for bugs #3266480 and #3041738.
Also add CHECKME to verify the accuracy of this workaround further.

This fixes the regressions #3291115, #3555404, #3596335 and #3610063.
SCI: Re-initialize more of MusicEntry on play

This fixes bug #3267956.
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
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