Optimization

Split the Kingdom of England into 3 (Mercia, Northumbria, and England)
Added a New Duchy (Cambridge) from The Boroughs, Essex, and East Anglia.

Fixed the error where the new duchies weren't part of the Struggle region
Made changes to the de-jure counties for duchies of Mercia, The Boroughs, Lancaster, and Northumbria
Made Moray independent from Alba

All Anglo-Saxon counties and characters have been assigned either Angle or Saxon culture, Jute culture is given a count in the Petty Kingdom of Wessex where it is present.
Anglo-Saxon culture no longer exists in 867. Will create a decision to form it soon.
Fixed where the event screen for starting the struggle didn't have a picture.
Created the Duchy of Sussex in Sussex and Somerset.
Created a new county in Kent, giving the duchy of Kent 2 counties after losing Sussex and Somerset.
Renamed the Duchy of Nottingham to 'The Boroughs'

Added Saxon culture to 2 provinces in England for testing purposes.
Split the Duchy of Mercia by creating the Duchy of Nottingham (not part of the struggle region for some reason?)
Completed all parameters to take the domination ending, have not done tooltips or the actual ending event yet.

Asatru Norse have access to Conquest CBs again, while Tribal Insular Irish and Gaels do not but have the Struggle Clash CB.

Quick fixes from previous update left un-noticed

Fixed bugs where all non-norse tribals didn't have access to conquest or kingdom invasion CBs.
Added Saxon (Replacing Saxon in germany with Sassen), Angle, and Jute cultures (not present on map yet)
Added a norse/british themed ending decision banners and icons.