Improve RA styling [Feedback wanted]

Description and notes

Improve the looks of the RA and make it feel less cramped.

Major change is moving the activation condition into it's own tab instead of at the top. Would like some feedback on this change.

Merge Checklist

• I have read CONTRIBUTING.md
  • and
    • my code editor has
      • ESLint support enabled
      • TypeScript support enabled
      • some form of spell checker
        • We suggest using a spell checker compatible with cSpell if possible
    • my changes compile successfully and seem to work properly
    • I am using the simple compiler (simple-compiler.[bat or sh])
    • I am using the normal compiler (compile.[bat or sh])
    • this is my first merge request
    • the changes in this merge request comply with the coding style defined in CONTRIBUTING.md

Changes made

• Improve CSS styling of the rule selector, hopefully makes it more obvious you can use drag'n'drop to reorder priorities.
• Move the activation condition into a tab instead of it's own section
• Add a bunch of space between elements to improve readability
• Various CSS tweaks

Things left to do

• code review (this is done by one or more people other than you)
• final tests
• let Pregmodder know that this is ready for merging