Verify that dispose functions are named correctly for all types

[jessegreenberg]

From https://github.com/phetsims/sun/issues/212 it was clear that dispose functions are being named without consistency.

The dispose function should be named such that the 'MyType' should have a dispose function that matches 'disposeMyType' exactly.

[jessegreenberg]

In a search, I found that the following repositories have dispose functions that break this convention:

• [x] build-an-atom
• [x] build-a-molecule
• [x] charges-and-fields
• [x] expression-exchange
• [x] griddle
• [x] isotopes-and-atomic-mass
• [x] rutherford-scattering
• [x] shred
• [x] sun

[jessegreenberg]

That should be all of them. Closing.