Respects dnd settings for sound playback.
Basic implementation uses in-memory wavs as buffers.
audioplay::playClip should not be called before previous clip ends.
Updated FORMAT.md to reflect no more audio_conf.txt
Bug: 29055299
Change-Id: Ifc358d7c85f11b8b54ae6446c40643b87bc567f2
Each frame directory may optionally contain a `trim.txt` to specify
how the image was trimmed relative to the animation's full size.
See FORMAT.md for more details.
Bug: 29055299
Change-Id: I7a291e9a52b4bbe50a29c519f6a4d0e2cc0389d7