RA Rework II Wishlist

Since I am nearly done with the surgery conversions I'll soon move on to integrating them into the RA. This will probably include a decent amount of refactoring of the RA code, so I might as well include or at least consider other improvements to the RA while working on it. And even if I don't touch related code, I'll probably integrate them afterward as their own thing.

• Rework the surgery
  • Rework RA Surgery for Surgery Procedures (#3326 (closed)).
  • Have RA Surgery apply to slaves in facilities.
  • Add option for RA Surgery to be applied to reach RA asset targets (for when atrophiers not unlocked yet).
  • When applying outside endweek, show which surgeries would be done.
• Improve the activation conditions selection
  • Make the UI easier to understand, especially the leader/facilities toggles
  • Add more useful predefined activation conditions & rethink the selection of them
    • Labels, Hips (#3564 (closed)), ...
  • (?) Allow combination of predefined conditions
  • Validation for custom conditions
• Rework features
  • Take rule priority into account for asset drug selection, or alternative fix. See #3447 (comment 190396).
  • Bring the looks into line with rest of the game. (a lot of work!)
• Implement features
  • Option to run rule section only once per slave
  • Add Encyclopedia entry to explain
    • Rule merging and what it means for creating rules
    • Custom conditions
    • Explain RA Surgery and how it only applies during endweek.

Replaces #2048 (closed) (and copies the unfinished tasks), though @i107760 feel free to continue working on it, just want to keep it in one place.

Though for this stuff larger in scope is fine too, since whenever I see the UI side of the RA, I want to rip it out. I've got the feeling this will involve a lot of refactoring.