PreResolveValidation

[zond]

It should be possible to pre-resolve validate orders, which would output warnings only for orders that didn't make sense in the context of that particular nation.

E.g. support orders for their own units that did something not matching the support, or convoy orders for units that didn't match the convoy.

[zond]

Also, "all units have orders" and "all build/disband orders are provided".

[zond]

Plan:

State has ValidateNext(godip.Nation) that calls the lates phase's Validate(godip.Validator, godip.Nation) that checks whatever the phase wants to check (enough build/disband orders, all units have orders, whatnot) and then calls ValidatePhase(godip.Validator, godip.Nation) for each order.
The orders will check that there isn't a support for a unit of the same nation that doesn't do the matching thing, and likewise for convoys.