Reactants, Products and Leftovers - publish 1.3 with PhET-iO and dynamic layout

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Added to worklist by @kathy-phet on 2/23/2023.

A big unknown is the Game screen. A prerequisite is a more general "Game design" task. That said...

The estimate that I provided for my part of this was:

(1) Convert to TypeScript (5500 lines) = 12 hours
(2) Dynamic locale = 6 hours
(3) PhET-iO instrumentation for static elements = 25 hours
(4) Convert dynamic elements to static = 15 hours. View elements are created on demand in the Sandwiches and Molecules screens. Rewrite so that they are created at startup.
(5) PhET-iO instrumentation for dynamic elements = 30 hours. A set of 5 challenges is created each time you select a game level. This will require PhetioGroup, custom IOTypes, etc.

TOTAL = 88 hours

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In today's general planning meeting, @kathy-phet said that the target publication date is "July".

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There is no longer a goal to publish this sim in July 2023, so unassigning.