Add Battlefield rule to allow trust casting

[claywar]

I affirm:

• [x] I understand that if I do not agree to the following points by completing the checkboxes my PR will be ignored.
• [x] I understand I should leave resolving conversations to the LandSandBoat team so that reviewers won't miss what was said.
• [x] I have read and understood the Contributing Guide and the Code of Conduct.
• [x] I have tested my code and the things my code has changed since the last commit in the PR and will test after any later commits.

What does this pull request do?

• Adds bool value to battlefield constructor to allow summoning of trusts (allowTrusts, Default: False)
• Updates mission and quest battlefields specified in https://www.bg-wiki.com/ffxi/Category:Trust#Available_Battle_Content to allow summoning of trusts
• Adjusts xi.trust.checkBattlefieldTrustCount() in cases of LB5 fights where battlefield participant count is restricted to 1, which should allow trusts with the Rhapsody in Umber KI

NOTE: rovKIBattlefields (LB5 fights) will obey the Rhapsody KI check and ignore allowTrusts by design.

Steps to test these changes

1. ENSURE GM IS TOGGLED OFF
2. Enter Shattering Stars battlefield without Rhapsody in Umber and attempt to summon trust (Should be rejected)
3. Enter Shattering Stars battlefield with Rhapsody in Umber KI and summon trusts to maximum count (Note: canCast takes priority, so without all appropriate KIs, you will still be restricted by that)
4. Enter mission battlefield and summon trusts where allowTrusts is set to True.
5. Enter battlefield and attempt to summon trusts where allowTrusts is False or Undefined (rejected)