Legends Of Learning Doesn't Pause Sound

[JRomero0613]

For phetsims/qa#196 when using Legends of Learning and pausing it the simulation pauses as intended. However if the sim is paused while John is getting shocked the sound will continue to play until the sim is resumed and all of the charges are discharged.

[jbphet]

Nice catch. I just took a look at this with @samreid, and he pointed me to the file 'LegendsOfLearningSupport.js, where the pausing is handled. Based on what we see in this sim, pausing the sim causes the globally available property phet.joist.sim.activeProperty` to go false. The sound manager should probably monitor this property and pause sounds when this happens.

I'll investigate doing this, or something similar, as a fix for this issue.

[JRomero0613]

Just to let you guys know but the continuous sound that plays to indicate a charge on John also continues to play when the sim is paused using Legends of Learning.

[KatieWoe]

Duplicate of #309 closing for @jbphet