Allows setting of validation options
(from any legal validation options object)
LIMITATIONS
Only 6 radiobuttons (and thus max of 6 choices) per option, in this incarnation.
Builds:
Builds are valid if:
supply center is owned by this power
supply centers is home to this power
province contains no unit
can build unit of that type in said province
if fleet specified, coast must be valid
default to army if no type specified AND supply center is inland
otherwise build fails.