Links Awakening: Implement New Game (#1334)

Adds Link's Awakening: DX. Fully imports and forks LADXR, with permission - https://github.com/daid/LADXR

worlds/ladx/Rom.py

@@ -0,0 +1,40 @@
+
+import worlds.Files
+import hashlib
+import Utils
+import os
+LADX_HASH = "07c211479386825042efb4ad31bb525f"
+
+class LADXDeltaPatch(worlds.Files.APDeltaPatch):
+    hash = LADX_HASH
+    game = "Links Awakening DX"
+    patch_file_ending = ".apladx"
+    result_file_ending: str = ".gbc"
+
+    @classmethod
+    def get_source_data(cls) -> bytes:
+        return get_base_rom_bytes()
+
+
+def get_base_rom_bytes(file_name: str = "") -> bytes:
+    base_rom_bytes = getattr(get_base_rom_bytes, "base_rom_bytes", None)
+    if not base_rom_bytes:
+        file_name = get_base_rom_path(file_name)
+        base_rom_bytes = bytes(open(file_name, "rb").read())
+
+        basemd5 = hashlib.md5()
+        basemd5.update(base_rom_bytes)
+        if LADX_HASH != basemd5.hexdigest():
+            raise Exception('Supplied Base Rom does not match known MD5 for USA release. '
+                            'Get the correct game and version, then dump it')
+        get_base_rom_bytes.base_rom_bytes = base_rom_bytes
+    return base_rom_bytes
+
+
+def get_base_rom_path(file_name: str = "") -> str:
+    options = Utils.get_options()
+    if not file_name:
+        file_name = options["ladx_options"]["rom_file"]
+    if not os.path.exists(file_name):
+        file_name = Utils.user_path(file_name)
+    return file_name