Arsenal - Make ACE_asItem and ACE_isUnique apply to CfgWeapons

[DartRuffian]

When merged this pull request will:

• Title. Use-case is for updating items from other mods to not act as mine detectors and still show in the ACE Arsenal.
  • Updating their simulation / type alone makes them work correctly, but they don't show as misc items since they do not inherit from CBA_MiscItem.

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