Use property binding in "Intermolecular Attractions and States of Matter"

[#62719204]
Fix "Diffusion & Molecular Mass", do not set params in "onLoad"

[#62719204]
Update "Pendulum" interactive

[#62719204]

Remove 'parametersToRetain' list from reloadModel call (these
parameters are retained by widgets anyway).
Remove 'reset' button which is now unnecessary.
Update "Spring" interactive

[#62719204]

Remove 'parametersToRetain' list from reloadModel call (these
parameters are retained by widgets anyway).
Remove 'reset' button which is now unnecessary.
Update "onClick Demo", use property binding instead of action scripts

[#62719204]