Atom scale float input option

[dignojrteogalbo]

Fixes #164

Discussion

Adds float input field into the atoms accordions on the "Mesh Options" dropdown. The task asks for a slider but in testing a slider is difficult to manipulate due to not being able to see scale values and imprecision of the slider control. I opted to use a float input field.

Testing

• [ ] Run ./build.sh
• [ ] Run GoVizzy.ipynb
• [ ] Switch to "Mesh Options"
• [ ] Verify toggle visibility still works.
• [ ] Verify color picker still works.
• [ ] Verify scale adjustment works.