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

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

.github/workflows/unittests.yml

@@ -65,6 +65,7 @@ jobs:
         python -m pip install --upgrade pip
         pip install pytest pytest-subtests
         python ModuleUpdate.py --yes --force --append "WebHostLib/requirements.txt"
+        python Launcher.py --update_settings  # make sure host.yaml exists for tests
     - name: Unittests
       run: |
         pytest