MusicPlus feature: Fade out at end of level

mazmazzrequested to merge
public-musicplus-feature-endoflevel into next

Fades out the level music when you exit the stage.

Also adds a level header MUSICINTERFADEOUT = milliseconds: instead of playing the intermission music, fade out the level music by milliseconds. Works for single player and co-op intermission screens.

Edited by mazmazz

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