complete the "Real Molecules" screen

[pixelzoom]

Because of the time involved in implementing a 3D molecule viewer (#15), the decision was made to publish Molecule Polarity without the Real Molecules screen (#27).

When the Real Molecules screen is added in a future version, here's what needs to be done:

• [ ] Implement a 3D molecule viewer, #15
• [ ] Address TODO issues in the code that reference issue #15
• [ ] Code review for any new code that is required to complete the screen
• [ ] Add description of the 3D model to model.md
• [ ] Add description of the 3D implementation to implementation-notes.md

[oliver-phet]

From phethelp:

I appreciate all the work that has been done to maintain PhET invaluable simulations through converting them to HTML5 format. Without taking too much of your time, I'm writing to request that someone work to adapt the "Real Molecules" function of the Molecule Polarity simulation to HTML5. Its so important for students to see the effect of polarity on larger, organic molecules with multiple dipoles to understand the concepts of solubility.

[pixelzoom]

Status for 1/6/2022 quarterly-planning meeting:

The status of this is unchanged since the last meeting:

• Basic 3D common-code exists, but nothing specifically related to molecules or this sim.
• We need a meeting to decide who is doing what, and how to move forward.
• The ball is in @kathy-phet's court.