… only take degrees for the angle input

We had it so that locked ellipse settings allow for either degrees or radians
for the angel input. However, I realized that we're not saving the data for
what unit is being used. This means that if an angle were saved as "30 degrees"
and then the page were reloaded, it would then show up as "0.523599 radians".

For the sake of simplicty and consistency, I'm changing this so that it only
takes degrees, and I'm changing it to a number input since it no longer needs
to evaluate expressions with pi (that required it being a text input).

Issue: https://khanacademy.atlassian.net/browse/LEMS-1941

Test plan:
`yarn jest`

Storybook
- http://localhost:6006/?path=/story/perseuseditor-editorpage--mafs-with-locked-figures-m-2-flag
- Confirm that the ellipse settings angle input shows degrees only
- Confirm that it is rotated correctly

…ettings

Added some icon buttons so that content authors can reorder the locked figure
settings. This can be used to make sure that one figure can render on top
of another figure as desired. (The lower they are in the settings, the more
in the front they are on the graph.)

Issue: https://khanacademy.atlassian.net/browse/LEMS-1951

Test plan:
todo

…anded state array updated with the movement.