cf #2188

cf #2188

cf #2188

fixes #2130, bad callers

fixes regression from 89885e55 #2192

fixes iwd2 ch2 transition — Oswald kept rambling into the video

fixes warnings when checking feats (IE_TOHIT wasn't being resolved)

perhaps the magic slot should get the same treatment

fixes raven temple challenges proceeding even when you still have gear

Three sound improvements

fixes the iwd2 stone puzzle completion playing a dozen copies of
the detection sound

Otherwise it's the index and that does not align with our enum.

see #2182

eg. dodge with the flame dance talisman

OpenAL does not treat stereo sources the same way as mono sources. An
old proposal is to split them into to two mono sources and play them
together so they are spatial, or what can be considered as this.

it looks like the original didn't draw detected traps until someone
actively detected them

fixes Mandal's body being discoverable too soon