Dev test: Graphing Lines 1.2.0-dev.1

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Dev test:
http://www.colorado.edu/physics/phet/dev/html/graphing-lines/1.2.0-dev.1/graphing-lines_en.html

iFrame test:
http://www.colorado.edu/physics/phet/dev/html/graphing-lines/1.2.0-dev.1/graphing-lines_en-iframe.html

Major changes were made to the Line Game screen in order to support its reuse in the Graphing Slope-Intercept sim. So we're mainly interested in testing the Line Game screen. All of the changes should be platform agnostic, but I've been testing mainly on Chrome, Safari and Safari mobile.

There have been no changes to the first 3 screens, but give them a quick test in case any common-code changes have broken something.

The 3 issues that were fixed in Graphing Slope-Intercept dev testing should also be fixed here. For a list of those issues, see #812.

Sim-specific query parameters are in GLQueryParameters.js.

Please mention this issue in any GitHub issues that you create.

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Note to self: This dev version was created with shas from graphing-slope-intercept 1.0.0-rc.1, with the following changes: graphing-lines master, chipper master

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@ariel-phet please prioritize and assign.

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@phet-steele Since this dev version was built from shas from graphing-slope-intercept 1.0.0-rc.1 (see #816 (comment)), it almost certainly has the web audio problem phetsims/vibe#30. Tracking that in phetsims/graphing-lines#76.

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Next dev (RC?) version will be built with shas from graphing-slope-intercept 1.0.0-rc.2.

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Due to significant code changes required to address phetsims/graphing-lines#78 (memory leak in Graphing Lines), @phet-steele and I agreed that this would be a good place to stop this dev test task. And we should do another dev test of Graphing Lines prior to starting on the next RC test for Graphing Slope-Intercept.

Leaving this issue assign to me so that I can identify issues that require regression testing in the next task.

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Dev testing continues in #825.

Closing.