2.04.0:minrog:6 BA Partial Merge

- removed a bunch of titles/characters/histories that were BA specific
and probably out of date
- deleted duplicate 00_tradepost.txt
- added event 7110045 - better_armies_mode (like hardcore_mode)
- merged BA mongol/SSI events into ck2+ base
- Castles culture - added gallaway/roman, removed latin
- merged BA retinue_subunits into ck2+ base
- moved BA localisation into ck2+ base
- merged triggered modifiers into ck2+ base, deleted pagan_economy BA
only modifier