Feitoria, and Nau changes

[Bechhold]

Allow the building of the Feitoria in the hex to become Portuguese territory. Also since borders don't grow or expand like they do in IV so allow them to be built in those areas than no civ claims or is near(x amount of hexes) and can be placed on routes of overland trade for extra + minus one or two diplo hits.

As for the Nau allow it's UA to have a cooldown.