[Minor] Shield armor inheritance customization

[Coronia]

Further customize shield's InheritArmorFromTechno logic:

• InheritArmor.Allowed lists TechnoTypes whose armor can be overridden. If empty, any TechnoType not listed in InheritArmor.Disallowed is okay.
• InheritArmor.Disallowed lists TechnoTypes whose armor can't be overridden. If empty, any TechnoTypes are okay as long as InheritArmor.Allowed is empty or they are listed on it.

In rulesmd.ini:

[SOMESHIELDTYPE]                            ; ShieldType name
InheritArmor.Allowed=                       ; list of TechnoTypes
InheritArmor.Disallowed=                    ; list of TechnoTypes

[github-actions[bot]]

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