refactor: moving ui.extends to core

* Settings and Singletons moved

core/settings/values.py

@@ -0,0 +1,17 @@
+from dataclasses import dataclass
+
+
+@dataclass(frozen=True)
+class _Ocr_ScoreDateSource:
+    FileCreated: str = "FileCreated"
+    FileLastModified: str = "FileLastModified"
+
+
+@dataclass(frozen=True)
+class _Ocr:
+    DateSource = _Ocr_ScoreDateSource()
+
+
+@dataclass(frozen=True)
+class SettingsValues:
+    Ocr = _Ocr()