HF/Crusade: Papal representative

[LimeKK]

The Pope will not join the war, but rather appoint a Papal Legate who will act in his stead (temporary title-holder who will declare the actual war).

[schwarherz]

For this it would make more sense to see if we can simply forbid the Pope from leading armies directly at any time, forcing His Holiness to use a Commander for his armies in the Holy Land. I think that would be good for balance at the very least. A temporary title holder shouldn't be needed.