Stardew valley: Add Marlon bedroom entrance rule (#3735)

* - Created a test for the "Mapping Cave Systems" book

* - Added missing rule to marlon's bedroom

* - Can kill any monster, not just green slime

* - Added a compound source structure, but I ended up deciding to not use it here. Still keeping it as it will probably be useful eventually

* - Use the compound source of the monster compoundium (ironic, I know)

* - Add required elevators

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Co-authored-by: NewSoupVi <57900059+NewSoupVi@users.noreply.github.com>

worlds/stardew_valley/content/vanilla/pelican_town.py

@@ -1,6 +1,6 @@
 from ..game_content import ContentPack
 from ...data import villagers_data, fish_data
-from ...data.game_item import GenericSource, ItemTag, Tag, CustomRuleSource
+from ...data.game_item import GenericSource, ItemTag, Tag, CustomRuleSource, CompoundSource
 from ...data.harvest import ForagingSource, SeasonalForagingSource, ArtifactSpotSource
 from ...data.requirement import ToolRequirement, BookRequirement, SkillRequirement, SeasonRequirement
 from ...data.shop import ShopSource, MysteryBoxSource, ArtifactTroveSource, PrizeMachineSource, FishingTreasureChestSource
@@ -229,8 +229,10 @@ pelican_town = ContentPack(
             ShopSource(money_price=20000, shop_region=LogicRegion.bookseller_3),),
         Book.mapping_cave_systems: (
             Tag(ItemTag.BOOK, ItemTag.BOOK_POWER),
-            GenericSource(regions=(Region.adventurer_guild_bedroom,)),
-            ShopSource(money_price=20000, shop_region=LogicRegion.bookseller_3),),
+            CompoundSource(sources=(
+                GenericSource(regions=(Region.adventurer_guild_bedroom,)),
+                ShopSource(money_price=20000, shop_region=LogicRegion.bookseller_3),
+            ))),
         Book.monster_compendium: (
             Tag(ItemTag.BOOK, ItemTag.BOOK_POWER),
             CustomRuleSource(create_rule=lambda logic: logic.monster.can_kill_many(Generic.any)),