4d6/constanix new provenances

[The4D6]

Added new militia provenances from the latest exemplary battles doc.

[The4D6]

Augmented Levy has a weird way of counting how many levy squads you need to have:
You need more Levies that Infantry units, but HQs don't count (and obviously neither do your Levy units)

I've renamed the original "Infantry:" category to "Infantry (Unit Type)" created another unit category called "Infantry". This second one is simply tagged on to a bunch of Militia units and is used to count how many infantry units you have for the purpose of how many levies you need.

This has now been implemented in a much cleaner way:

The category changes to the core catalogue have been revoked.