Confederation has been entirely overhauled, it is now only available to factions that hold sufficient political influence to exert control over their peers. I have tried to remain as loreful as possible with each culture's political landscape. Not all cultures have been changed. Here's the full detail:
__________________________________________________________________________________________

The Empire:
- The Cult of Sigmar can confederate all Empire factions
- The Golden Order can confederate all Empire factions
- The Huntsmarshal's Expedition can confederate the New World Colonies
- Other Empire factions can confederate The Cult of Sigmar and The Golden Order, but cannot confederate anyone else

Dwarfs:
- Karaz-a-Karak can confederate all Dwarf factions
- The Ancestral Throng can confederate all Dwarf factions
- Other Dwarf factions can confederate The Ancestral Throng and Masters of Innovation, but cannot confederate anyone else

Vampire Counts:
- The Barrow Legion can confederate Caravan of Blue Roses, but cannot confederate anyone else
- Caravan of Blue Roses can confederate The Barrow Legion, but cannot confederate anyone else
- Other Vampire Count factions can confederate each other

Greenskins:
- The Bloody Handz can confederate all Greenskin factions
- All Greenskin factions can confederate The Bloody Handz, but cannot confederate anyone else through diplomacy (they can still confederate by force)

Wood Elves:
- Argwylon can confederate Talsyn
- Other Wood Elf factions cannot confederate Talsyn, but can confederate everyone else

Bretonnia:
- Couronne can confederate all Bretonnian factions
- Carcassonne can confederate all Bretonnian factions
- Other Bretonnian factions cannot confederate

Dark Elves:
- Dark Elf factions cannot confederate Naggarond, Har Ganeth or the Cult of Pleasure, but can confederate everyone else

Skaven:
- Skaven factions cannot confederate members of the Council of Thirteen, but can confederate everyone else

Kislev:
- Kislev factions cannot confederate The Ice Court, but can confederate everyone else
- The Ice Court cannot confederate The Great Orthodoxy

Grand Cathay:
- The Jade Court can confederate The Northern Provinces and The Western Provinces
- Other Cathayan factions cannot confederate the Dragon Children, but can confederate everyone else

- Found a solution for the issue with Trade Settlement UI mentioned in the previous note. It will now be properly hidden when the diplomatic attitude is below the opinion threshold set in MCT (default: 30)

- Trade Settlement is no longer hidden because of some issue encountered with UI delay. Instead, the option is now disabled below the opinion threshold. This design is flawed as it essentially makes it possible to trade with anyone as long as you meet the opinion requirements. I will have to rewrite to script to prevent sworn enemies to trade with each other in certain edge cases.

* Fixed the trade settlement button reappearing when choosing a diplomatic option.

* Added support for MCT

* Factions that hate each other can no longer trade settlements.