Added compatibility for Merger of Rules

3.13 compat

Just descriptor change, nothing major here.

3.12 compat

3.11 compat
- frontend.gui updated

3.10 compat

No major changes this version.

3.9.3 compatibility

Changes:
updated frontend

Just a version change to get rid of that pesky launcher thing

3.9.1 compatibility

Changes:
- Added logging for planet state spawns. These logs will appear in the game.log file and will show which ones are spawning in the game.
- Minor loc fixes
- Updated frontend.gui - thanks Harain!

Finally got around to updating the mod quickly. Thankfully nothing touched this mod too much beyond the frontend.gui changes but like always, please post any bugs you find on the RMG discord server.