[OC2] Enabled DLC Option (#1688)

- New OC2 option `DLCOptionSet`, which is a list of DLCs whose levels should or shouldn't be used for entrance randomizer (and mention in documentation). By default, DLC owners now need to enable DLCs in weighted settings.
- Throw user-friendly exceptions when contradictory settings are enabled
- Slightly relax generation requirements for sphere 1/2 level permutations
- Write entrance randomizer info in spoiler log
- Skip adding "Dark Green Ramp" to item pool if Kevin Levels are disabled

worlds/overcooked2/docs/setup_en.md

@@ -51,8 +51,11 @@ To completely remove *OC2-Modding*, navigate to your game's installation folder
 
 1. Visit the [Player Settings](../../../../games/Overcooked!%202/player-settings) page and configure the game-specific settings to taste
 
+*By default, these settings will only use levels from the base game and the "Seasonal" free DLC updates. If you own any of the paid DLC, you may select individual DLC packs to include/exclude on the [Weighted Settings](../../../../weighted-settings) page*
+
 2. Export your yaml file and use it to generate a new randomized game
-- (For instructions on how to generate an Archipelago game, refer to the [Archipelago Web Guide](../../../../tutorial/Archipelago/using_website/en))
+
+*For instructions on how to generate an Archipelago game, refer to the [Archipelago Web Guide](../../../../tutorial/Archipelago/using_website/en)*
 
 ## Joining a MultiWorld Game