ATV-TW: a trait (and future ancillary) validator for RTW/M2TW

[Makanyane]

Thanks both for getting this moving again.

New version is working for me - old one gave up on my rather extensively mangled file, though I admit to not re-trying it since working more on file.

For triggers its throwing this out

Trigger trigger_slayer4
WhenToTest PostBattle

Condition BattleGeneralKilled
and not GeneralFoughtFaction slave

Affects slayergeneral 1 Chance 100

as wrong though I thought it was working in practice - did check it at one stage and think it triggers even if 'general' is actually a captain not family member but I think it works. It also doesn't like WithdrawsBeforeBattle on End Turn check but have noticed that vanilla uses I_WithdrawsBeforeBattle on "WhenToTest PreBattleWithdrawal"
so might switch to that arrangement instead anyway.

Other thing I put in deliberately to see if it would check is a duplicated trigger name, it doesn't seem to catch that...