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/test/rules/TestBooks.py

@@ -0,0 +1,26 @@
+from ... import options
+from ...test import SVTestBase
+
+
+class TestBooksLogic(SVTestBase):
+    options = {
+        options.Booksanity.internal_name: options.Booksanity.option_all,
+    }
+
+    def test_need_weapon_for_mapping_cave_systems(self):
+        self.collect_lots_of_money(0.5)
+
+        location = self.multiworld.get_location("Read Mapping Cave Systems", self.player)
+
+        self.assert_reach_location_false(location, self.multiworld.state)
+
+        self.collect("Progressive Mine Elevator")
+        self.collect("Progressive Mine Elevator")
+        self.collect("Progressive Mine Elevator")
+        self.collect("Progressive Mine Elevator")
+        self.assert_reach_location_false(location, self.multiworld.state)
+
+        self.collect("Progressive Weapon")
+        self.assert_reach_location_true(location, self.multiworld.state)
+
+