compatibility update for FotE fix

- enhanced models for low tier sarmatian and sassanid cavalry units,
- reworked shields for several milites/pseudocomitatenses units

- temporary fix for missing helmets on roman generals (rare, but happened)
- enhanced models for low tier hunnic units

- full fix to missing gear + some minor bugs removed

- fixed CTD for AI controlled ERE at custom battles

- hotfix for missing shields textures
- fixed Lakhmid trait for religion

- compatibility update for FotE
- reworked oval shields for roman units
- expanded roster for shielded horse archers according to Notitia register (limitanei barracks)

- minor maintenance

- fixed unit's model for equites batavi seniores

- fixed skill for radical priest
- fixed helmets distribution for comitatenses units