Renamed AudioStream hold related notifications

Ignore-this: d8235cff51041bf4090babdd2202669e

darcs-hash:20090720091904-1e3d8-ebf4ca4e8dad7454888605279b101fc31397acc4
Re-implemented workaround that fixes deadlock when WaveFile stops playing

darcs-hash:20090720093426-58103-ae8b6a9891bbe34c08c47a8dd3260a61e91649ef