[Vanilla Enhancement] Customize whether warhead can be used to targeting ironcurtained technos or not

[NetsuNegi]

• In vanilla, computer player's techno always dont attack ironcurtained technos. Now you can customize it.
• 在原版，电脑玩家的科技类型总是不会攻击受到铁幕保护的科技类型。现在你可以自定义它了.

In rulesmd.ini:

[CombatDamage]
CanAITargetIronCurtained=false                  ; boolean
CanHumanTargetIronCurtained=true            ; boolean

[SOMEWEAPON]                          ; WeaponType
CanTarget.IronCurtained=                  ; boolean

[github-actions]

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[TaranDahl]

I think the current handling is unnecessary. You only need to:

bool canTargetIronCurtained = !pThis->Owner->IsControlledByHuman() ? RulesExt::Global()->CanHumanTargetIronCurtained : RulesExt::Global()->CanAITargetIronCurtained;

if (pTargetTechno->IsIronCurtained() && !pWeaponExt->CanTarget_IronCurtained.Get(pWeapon->Damage >= 0 ? canTargetIronCurtained : true))
    return CannotFire;