[FEATURE] Mod state per save

[cheese3660]

Feature Information

Feature description

Currently we only have a global mod state, where a mod is either installed or not. We should add a way to set whether a mod is enabled for any given save.

Solution proposal

1. Add a field in the campaign creation where you can add or remove mods for this save
2. Enforce a contract w/ mods that only allows them to do stuff when they are loaded in a save.
   (Except for mods that do stuff on the main menu)

[jan-bures]

For 1. to work, we'd need to redo the whole toggle system from being loaded with a preloader patch before BepInEx starts loading plugins to instead just destroying the mods at runtime