Adds RHPreferences submodule. Refs #10.
Adds placeholder settings pane, hooks menu action. Refs #10.
Forces quiting app on main window close. Refs #6, #10.
Moves construction to background thread. Refs #10.
Moves settings xib to resources directory. Refs #10.
Implements weight settings without propagation. Refs #10.
Implements settings vc notification updates. Refs #10.
Adds unit refresh to root vc. Refs #10.
Fixes decimal places after comma during modification. Refs #10.
Documents task in changes log. Refs #10.
Merge branch 'feature/t10_add_preferences_window'