Yoshi's Island: Implement New Game (#2141)

Co-authored-by: Silvris <58583688+Silvris@users.noreply.github.com>
Co-authored-by: Alchav <59858495+Alchav@users.noreply.github.com>
Co-authored-by: NewSoupVi <57900059+NewSoupVi@users.noreply.github.com>
Co-authored-by: Exempt-Medic <60412657+Exempt-Medic@users.noreply.github.com>

worlds/yoshisisland/setup_bosses.py

@@ -0,0 +1,19 @@
+from BaseClasses import CollectionState
+from typing import TYPE_CHECKING
+if TYPE_CHECKING:
+    from . import YoshisIslandWorld
+
+
+class BossReqs:
+    player: int
+
+    def __init__(self, world: "YoshisIslandWorld") -> None:
+        self.player = world.player
+        self.castle_unlock = world.options.castle_open_condition.value
+        self.boss_unlock = world.options.castle_clear_condition.value
+
+    def castle_access(self, state: CollectionState) -> bool:
+        return state.has("Boss Clear", self.player, self.castle_unlock)
+
+    def castle_clear(self, state: CollectionState) -> bool:
+        return state.has("Boss Clear", self.player, self.boss_unlock)