Bug 1057110 - Add separate PRLogModule for AppleDecoderModule.  r=cpearce

The apple media decoders are quite noisy. Switching them to their
own "AppleMedia" log module simplifies the output when debugging
demuxer-specific issues.
Bug 1057110 - Don't log h.264 sample sha1 by default. r=cpearce

This was useful for comparing input between different demuxers
but isn't really necessary now that things are running. Can be
removed when things are more stable.