Added Unit Converter for on-the-fly conversions
Added better calculation for wing dim and edited editor

New formula for calculating wing dimensions based on aspect ratio and wing area.
Changed the editor to use the new formula when aligning wing
Added weight to the editor
small changes to object structure, unit conversion types now available
Added convenience methods for getting specific unit types
Made the User HUD much prettier, and show various unit types
Renamed FlightBodies to FlightObjects. It just makes more sense.

Plus, "flight bodies" just sounds wrong...