Changed chance of getting druid trait

To limit the number of rulers with the druid trait
Added stock localisations for training chain
Celtic Spiritual counsellors must now be Druids
Updated to CKII 2.0
Added evil gods

Also added priest titles
Fixed hellenic pagans not having Great Holy Wars
Change to decisions
Druids and Bards now necessary for divinations, aonach tailteanns and bardic performances
Fixed a wrong localisation
Added St-Kilda event chain
Kilda event will only fire for celts
Fixed wrong religion icon
Added province modifiers and localisations
Added base sacred celtic symbols mechanic
Updated to CKII: 2.0.1
Fixed bugs with validator
Fixed a CTD with new feature
Added unique modifiers for celtic sacred symbols

Also fixed inversed values for certain modifiers
Druids and Poets now necessary in order to have chancellors and sprititual advisors when celtic
Bug fixing
Fixed bugs with sacred symbol events and localisations
Druidic religious head will now be called Myrdynn and Dryad