Add GUI for controlling organelle split order

[hhyyrylainen]

Brief Description of What This PR Does

Adds a new GUI tab in the microbe editor to pick organelle growth order

Related Issues

closes #1622

Progress Checklist

Note: before starting this checklist the PR should be marked as non-draft.

• PR author has checked that this PR works as intended and doesn't
  break existing features:
  https://wiki.revolutionarygamesstudio.com/wiki/Testing_Checklist
  (this is important as to not waste the time of Thrive team
  members reviewing this PR)
• Initial code review passed (this and further items should not be checked by the PR author)
• Functionality is confirmed working by another person (see above checklist link)
• Final code review is passed and code conforms to the
  styleguide.

Before merging all CI jobs should finish on this PR without errors, if
there are automatically detected style issues they should be fixed by
the PR author. Merging must follow our
styleguide.

[hhyyrylainen]

I found a bug when testing but I'm not going to fix this in this PR: #5696

[CI09]

Playtest works

[dligr]

I can confirm that this works in-game. Save-loading doesn't reset the split order. The only unexpected behavior I noticed is that it isn't possible to undo changes to the order with the editor's undoing (unless this is intended).
The code seems to be fine.

[hhyyrylainen]

it isn't possible to undo changes to the order with the editor's undoing (unless this is intended).

I didn't make it into an action that would go into the undo/redo system as that would have complicated things a lot. It is in fact implemented separately from the action system and the results are only applied when exiting the editor as I thought that would be a pretty good way to ensure that mixed edits and growth order changes work at least reasonably well.