expose Sound to ScriptEngine
add AudioScriptingInterface to expose playSound to JS
repairs to AudioMixer and audio injection flow
open up ASI playSound method to ScriptEngine
remove no longer needed QDebug includes
fix broken build by removing ASI as friend to AI
fix copyright years
Merge pull request #1443 from birarda/master

open up more audio to JS
simplify loopback trigger for injected audio
fix a glaring omission - actually move the audioInjector to QThread
Merge pull request #1445 from birarda/master

simplify loopback trigger for injected audio, actually move to QThread
Merge branch 'master' of https://github.com/worklist/hifi into metavoxels