use onStageInitialized callback to get the stage object from SWF.embed
(somewhat) implements SoundMixer.soundTransform and SoundChannel::soundTransform

so far, only support for volume in <audio>
also adds masterVolume to SoundMixer to globally override volume
implements mute button
implements SWFController for inspector
displays instance name in display list, if set
implements pause/play and step buttons, adds icon font
disables step button when swf is playing
always update display list tree when pausing or stepping
Merge remote-tracking branch 'origin/inspector' into mozmaster

Conflicts:
	src/flash/media/SoundChannel.js