Sinuhet and Darth formation AI to EB

[KarstenChu]

Well, just using Darth's formations, I got the group formations to work in a custom battle without BI.

Thorlof, how does this work? Can you explain how "unit_type light_pilum_infantry" works? I checked export_descr_unit.txt and the hastati still have their regular category : infantry and class : light.

My goal here is to make just the roman manipular formation work for my current campaign and maybe give the AI Sinuhet's formations if it doesn't mess anything up.