Apply temporal masking only in views so it doesn't disrupt the propagation

[samreid]

Perhaps if we apply the temporal masking in the downstream views only, it will not perturb the wave physics. We would need to apply it in all downstream views, including (but perhaps not limited to) the wave area display, the chart display, the intensity screen, etc.

@arouinfar do you think that's worth investigation? It may be one way to address #304

[samreid]

@arouinfar and I discussed this and agreed it sounds like it is worth investigation.

[samreid]

This will also allow us to use a very narrow band (no tolerance) without disrupting the integration.

[samreid]

Proposed fix is here and working great in initial testing. Here's a dev version with this fix: https://phet-dev.colorado.edu/html/wave-interference/1.0.0-dev.59/phet/wave-interference_en_phet.html

[samreid]

We agreed this is looking good, closing.