start splitting dungeon menu files

include/dungeon_main.h

@@ -0,0 +1,16 @@
+#ifndef GUARD_DUNGEON_MAIN_H
+#define GUARD_DUNGEON_MAIN_H
+
+#include "structs/str_text.h"
+
+void DungeonHandlePlayerInput(void);
+void sub_805E804(void);
+void sub_805EE30(void);
+void sub_805EFB4(Entity *a0, bool8 a1);
+void sub_805F02C(void);
+ActionContainer *GetLeaderActionContainer(void);
+u16 GetLeaderActionId(void);
+bool8 sub_805FBE8(u8 *a0);
+void CreateDungeonMenuSubWindow(Window *mainWindow, s32 subWindowX);
+
+#endif