Void Elves

[ercarp]

Changelog:

• Added a portrait modifier (being_void) for Void Elves.
• Added decision Embrace Ren'dorei Culture decision, allowing a character of Highborn heritage culture and being_void trait to change their culture to Void Elf. This also changes any vassals, family, and vassal's family who are also of Highborn heritage culture and either have the trait, or have the Void religion.

How to test:

1. Test the portrait modifier in-game by using the console command add_trait creature_void_elf ID on high/blood elves, or by generating random characters in the Ruler Designer using the temporary void_elf_teaser ethnicity.
2. Provide feedback on the look of the void elves and how they could be (reasonably) improved.
3. Test the decision

[edmund-h]

Ok so this is what myself and @Raged50 settled on with input from @Grekopithikos

requirements for decision:

• highborne cultural group
• mystic trait
• at least duke title tier
• the sin'dorei must exist or you have a maxed learning education

decision creates event chain:

• you build an arcane observatory special building
• you make contact with a dark naaru
• you convert to kareshi religion and travel the void for 1000 subjective years
• you become a void being and return to your people with the dark naaru enslaved
• you establish the void elf culture

this event chain can be adapted fully or in part when unlanded play is available

[edmund-h]

this PR is superseded by https://github.com/Warcraft-GoA-Development-Team/Warcraft-Guardians-of-Azeroth-2/pull/1384