Revert "Parse the default property list at the start of the SoundNodeWave object so we can find the start of the "contents" (bulk object mirrors?). Different sounds in Xcom have different numbers of properties, e.g. some have a bLooping property and others do not."

This reverts commit 70e01c478534bf1e7211deccfe83a2ae0f9c6938.
Revert "Add constants for offsets in the sound file. Add .gitignore"

This reverts commit bfc3c76b295df2b06e0a1f891cf19e9674ee2d06.
Revert "Add REPLACEMENT_SOUND support"

This reverts commit 0c6ddd15f8db246583cdc82d1484fbef95302286.