Rurikid Branches; Cultural and Dynastic Changes.

10 Rurikid Branch Dynasties (with Custom-made Coats of Arms) now added.
All Rurikid characters received appropriate dynasty changes (where
necessary). Added some nicknames and localisation for those nicknames.

Cultures changed to appropriate tribal culture for all 867 AD
characters.

Cultures changed to appropriate tribal culture (Severian, Slovenian, or
Volhynian) for all 769 AD characters. These characters may need further
changes, based on position.