Memory testing

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No description provided.

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Each of the snapshots were collected with a 1 minute interval for a total of five minutes with ea, fuzz and brand=phet.

For the last snapshot (6), I forced a garbage collection before taking the snapshot

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There is no obvious memory leakage of sim-specific classes. This looks like a very reasonable memory footprint

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We'll need to do memory testing again when the sim is feature complete, and all significant issues have been addressed.

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Since the sim is going to support brands=phet,phet-io, we'll need to do memory tests for both. So changing the title of this issue.

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Since this sim has changed so much, and since we now need to test both phet and phet-io brands, I'm going to close this issue, and resume testing in new issues.