Settings UI

Modified/Changed/Moved around some settings UI elements:
In SettingsView:
* moved edit stage to the top and save/change layout to the bottom
* removed stage apron
In ViewView:
* added stage apron
* added spike tape switch
* moved grid options to the top
* removed show grid
In GridOptionsView
* added show grid
* made ruler to a switch
* made measurement into "Use Metric System" switch
* made spacing slider