Migrate overrides.js into code

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... before republishing this sim.

ph-scale-overrides.js and ph-scale-basics-overrides.js must be addressed at the same time.

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Baseline versions published before making changes:

• https://phet-dev.colorado.edu/html/ph-scale/1.7.0-dev.2/phet/ph-scale_all_phet.html
• https://phet-dev.colorado.edu/html/ph-scale/1.7.0-dev.2/phet-io/
• https://phet-dev.colorado.edu/html/ph-scale-basics/1.7.0-dev.1/phet/ph-scale-basics_all_phet.html
• https://phet-dev.colorado.edu/html/ph-scale-basics/1.7.0-dev.1/phet-io/

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My strategy for this migration was to do the macroScreen elements first. They made up the entire contents of ph-scale-basics-overrides.js, and they were repeated in ph-scale-overrides.js. That was done in the above commits, and ph-scale-basics-overrides.js is now empty.

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Migration of metadata for model elements was completed in the above commits.

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Migration is complete. Time was 1 hour. There were no API changes, and no bugs encountered in the overrides.js file.

Deployed after migration:

• https://phet-dev.colorado.edu/html/ph-scale/1.7.0-dev.3/phet/ph-scale_all_phet.html
• https://phet-dev.colorado.edu/html/ph-scale/1.7.0-dev.3/phet-io/
• https://phet-dev.colorado.edu/html/ph-scale-basics/1.7.0-dev.2/phet/ph-scale-basics_all_phet.html
• https://phet-dev.colorado.edu/html/ph-scale-basics/1.7.0-dev.2/phet-io/

Closing