Fixed Sassanids being able to form Zoroastrian Persia

Fixed Column 2 from King of Kings tree overlapping with new pre-1204 Byzantine missions

Fixed issue with state UI GFX appearing incorrectly

Fixed bug with estate icons appearing incorrectly

Updated to 1.36!
- Added a new mission tree for Byzantium Post-Islam (from 641 to 1204), with 54 new mission tasks in total (it's not OP, I promise)
- Added new government mechanics for Parthia and the Huns

- Added new Daoist religion
- Added new tags, like the Daoist theocracy of Hanzhong during the fall of the Han dynasty
- New Disasters: Fitna of al-Andalus and Byzantine Plague

Many more mission trees are WIP but could not be included in time for the 1.36 update, so they will be added (hopefully) soon.