Cleanup: split user preferences out of wm.py

These operations are for handling preference related tasks so move into
into a preferences file.

Operators still need to be renamed.

release/scripts/startup/bl_operators/__init__.py

@@ -35,14 +35,15 @@ _modules = [
     "mask",
     "mesh",
     "node",
-    "object_align",
     "object",
-    "object_randomize_transform",
+    "object_align",
     "object_quick_effects",
+    "object_randomize_transform",
     "presets",
     "rigidbody",
     "screen_play_rendered_anim",
     "sequencer",
+    "userpref",
     "uvcalc_follow_active",
     "uvcalc_lightmap",
     "uvcalc_smart_project",