Core: Add settings API ("auto settings") for host.yaml (#1871)

* Add settings API ("auto settings") for host.yaml

* settings: no BOM when saving

* settings: fix saving / groups resetting themselves

* settings: fix AutoWorldRegister import

Co-authored-by: el-u <109771707+el-u@users.noreply.github.com>

* Lufia2: settings: clean up imports

* settings: more consistent class naming

* Docs: update world api for settings api refactor

* settings: fix access from World instance

* settings: update migration timeline

* Docs: Apply suggestions from code review

Co-authored-by: Zach Parks <zach@alliware.com>

* Settings: correctly resolve .exe in UserPath and LocalPath

---------

Co-authored-by: el-u <109771707+el-u@users.noreply.github.com>
Co-authored-by: Zach Parks <zach@alliware.com>

worlds/alttp/__init__.py

@@ -1,6 +1,7 @@
 import logging
 import os
 import random
+import settings
 import threading
 import typing
 
@@ -29,6 +30,16 @@ lttp_logger = logging.getLogger("A Link to the Past")
 extras_list = sum(difficulties['normal'].extras[0:5], [])
 
 
+class ALTTPSettings(settings.Group):
+    class RomFile(settings.SNESRomPath):
+        """File name of the v1.0 J rom"""
+        description = "ALTTP v1.0 J ROM File"
+        copy_to = "Zelda no Densetsu - Kamigami no Triforce (Japan).sfc"
+        md5s = [LttPDeltaPatch.hash]
+
+    rom_file: RomFile = RomFile(RomFile.copy_to)
+
+
 class ALTTPWeb(WebWorld):
     setup_en = Tutorial(
         "Multiworld Setup Tutorial",
@@ -123,6 +134,8 @@ class ALTTPWorld(World):
     """
     game = "A Link to the Past"
     option_definitions = alttp_options
+    settings_key = "lttp_options"
+    settings: typing.ClassVar[ALTTPSettings]
     topology_present = True
     item_name_groups = item_name_groups
     location_name_groups = {
@@ -219,9 +232,16 @@ class ALTTPWorld(World):
 
     create_items = generate_itempool
 
-    enemizer_path: str = Utils.get_options()["generator"]["enemizer_path"] \
-        if os.path.isabs(Utils.get_options()["generator"]["enemizer_path"]) \
-        else Utils.local_path(Utils.get_options()["generator"]["enemizer_path"])
+    _enemizer_path: typing.ClassVar[typing.Optional[str]] = None
+
+    @property
+    def enemizer_path(self) -> str:
+        # TODO: directly use settings
+        cls = self.__class__
+        if cls._enemizer_path is None:
+            cls._enemizer_path = settings.get_settings().generator.enemizer_path
+            assert isinstance(cls._enemizer_path, str)
+        return cls._enemizer_path
 
     # custom instance vars
     dungeon_local_item_names: typing.Set[str]