Overhaul of the sector UI

+ Reduced maximum number of routes to 1/3 of total possible routes
+ Added recording of border regions
+ Added visual borders between empires for colourblind users
+ Made map redrawing more efficient by only redrawing when changes occur or when an element is selected
+ Made numeric display more user friendly by adding commas to numbers
+ Added population display to planets
+ Added population display to sectors
+ Added planet surface area and planet surface gravity display to planets
+ Added colours to route names to show the ownership of destinations
+ Added border region display to stars