[added] Ambient music when being near or inside water

[mugg91]

Description

This adds ambient music and slightly improves the music script files.

• Don't determine booleans beforehand, determine them on the go instead.
• Use the same logic when determining if we are in a cave or up in the sky across CTFMusic, WARMusic and ChallengeMusic
• Night ambient added to CTFMusic
• "Near water" ambient added to CTFMusic, WARMusic and ChallengeMusic
• Underwater ambient added to CTFMusic, WARMusic and ChallengeMusic
• Use map tilesize rather than hard-set 8 when checking booleans

ChallengeMusic checks if it should fade to an ambient, but only in warmup for some reason. I didn't touch this script further but might need looking into.

TDMMusic is not touched, doesn't support ambient music (yet).

"Near water" ambient taken from https://pixabay.com/sound-effects/flowing-water-at-buttsbury-wash-59302/

Water, River, Field-recording sound effect. Free for use.

Underwater ambient taken from https://pixabay.com/sound-effects/underwater-ambiencewav-14428/

Ambience, Underwater, Constant sound effect. Free for use.

Tested in offline.

[mugg91]

Video demonstrating the ambient music.

WaterAmbient.mp4

Please be aware of bug #2458