Crisis of the Third Century: convert major landowners as direct vassals

[IhateTrains]

https://discord.com/channels/612683871112396800/692883287336681592/1233823101054091406

Save for testing provided by @diskianterezh, latest C3RD version is needed:
https://discord.com/channels/612683871112396800/692883287336681592/1237800781986529391

[diskianterezh]

Are interesting in the save :

• two duchies
• one autonomous domain
• An Imperial Crisis empire (a rival empire that has dynamically splitted in a military anarchy)

Duchies should have very low taxes and moderate/high levies obligations, out of dejure territory
Autonomous domain should be like anyother vassal, with one obligation step lower. The owner of the domain is the ruler of it, in dejure territory
Major landowners should have their personal domain translated, with the council privilege
Imperial crisis split should have a direct claim on the main empire, and vice-versa, maybe later a struggle could be implemented.