informal dev test of "Solve It!" (game) screen

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I'd love to get an hour or two of @phet-steele's time to test the "Solve It!" screen during the week of 4/30. No need for a test matrix, or coverage on all platforms - one desktop and a little bit of iPad would be great. FYI, I've tested it mostly on macOS+Chrome and iPad.

Closing #38 (challenge engine) is a prerequisite to testing. @amanda-phet expects to complete that issue by 4/27. I'll publish a dev version when we're ready.

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1.0.0-dev.107 is ready for informal dev testing.

Please focus on the "Solve It!" screen.

User-interface design is specified in issue #34.

Challenge generation is specified in this design document and issue #38.

Available query parameters are in EqualityExplorerQueryParameters.

Please test using ?log&showAnswers, add &ea if running from master. Provide screenshot and browser console output for any issues notes. Link issues to this issue.

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#63 required extensive changes to the game. Use 1.0.0-dev.108 or master for testing.

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@phet-steele has completed testing. The only issue was #84, and it's been addressed.

Closing.