Doudecimal

Doudecimal, base 12 only UInt.

Allow simple use of Doudecimals.

For example

    var dd:Doudecimal_= {doudecimal:'2↊1'};
    trace( dd );
    trace( dd.toDozenal() );
    var v1: Doudecimal = 0;
    var v2: Doudecimal = '2A4';
    trace( v1+v2 );

More complex use

Working on Doudecimal_Image and Doudecimal_Color WIP, aspects of Int not being properly 32 are tiresome.