🔨 Add BCNM Rule to allow trusts with no additional requirements

[claywar]

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Describe the feature

Add value to BCNM rules to allow for trusts to be spawned within the arena. Certain fights (A Thief in Norg) allow for this with no Rhapsody KI requirement. This is most likely better done after conversions and removal of unused bits (RULES_MAAT, and eventually treasure on spawn)