Feature: Unit Aliases

[Mochnant]

It would be useful to allow the setting of a human readable "unit alias" that would be an alternative to unit IDs.

For example:

GIVE 6254 100 SILVER

becomes...

GIVE "AXMEN" 100 SILVER

Ideally these would not have to be unique, to simplify automating orders when any unit aliased AXMEN would do.

[nedbrek]

I think this is doable. I should also be able to make "FORM" commands work with it ("FORM AXMEN")