Fix handling of dynamic warps in map code

This adds handling for some special cases related to map warps.

Dynamic warps are warps that have a dynamic destination based on some in-game state.

One example for that is the entrance area of Terra Cave on Emerald (where Groudon is found.)

Before, the Map debug tab would crash the emulator on this map. Now it works.

modules/map.py

@@ -5,7 +5,7 @@
 
 from modules.context import context
 from modules.game import decode_string
-from modules.memory import unpack_uint16, unpack_uint32, read_symbol, get_symbol_name
+from modules.memory import unpack_uint16, unpack_uint32, read_symbol, get_symbol_name, get_save_block
 from modules.pokemon import get_item_by_index, Item
 
 
@@ -510,9 +510,24 @@ def destination_map_number(self) -> int:
 
     @property
     def destination_location(self) -> "MapLocation":
-        destination_map = get_map_data(self.destination_map_group, self.destination_map_number, (0, 0))
-        destination_warp = destination_map.warps[self.destination_warp_id]
-        destination_map.local_position = destination_warp.local_coordinates
+        map_group = self.destination_map_group
+        map_number = self.destination_map_number
+        warp_id = self.destination_warp_id
+
+        # There is a special case for 'dynamic warps' that have their destination set
+        # in the player's save data.
+        if map_group == 127 and map_number == 127:
+            map_group, map_number, warp_id = get_save_block(1, offset=0x14, size=3)
+
+        destination_map = get_map_data(map_group, map_number, (0, 0))
+
+        # Another special case is when there is no corresponding target warp on the
+        # destination map we use _this_ warp's coordinates as the destination.
+        if warp_id == 0xFF:
+            destination_map.local_position = self.local_coordinates
+        else:
+            destination_warp = destination_map.warps[warp_id]
+            destination_map.local_position = destination_warp.local_coordinates
         return destination_map
 
     def to_dict(self) -> dict: