Make vitrification event recognize faction succession

[Milopetilo]

Summary

Bugfixes "Make vitrification event remove visual effect on succession"

Purpose of change

Fixes #71256.

Describe the solution

Add an EOC that triggers "alter_timed_events": "vitrified_farm_escape_key" on avatar change. Also changed the variables to be on the alpha talker.

Describe alternatives you've considered

Put it in the vitrified_death EOC, but it doesn't seem to work sadly.

Testing

Went in-game with changes, activated the event, died from vitrifying and from other causes, switching to an NPC correctly removed the vitrified farm and visual effects. Also checked that normal faction succession still succeeds.

Additional context

[andrei8l]

This should be have "global": true so it doesn't run for NPCs as well.

And 1s recurrence still seems excessive. IMO the best solution is to scope all the variables on the alpha talker (ex. vitri_glass_entered -> u_vitri_glass_entered). Saves that are in the middle of that encounter will have the chain broken, but I think it's a positive change overall.

[Milopetilo]

I changed the scope on the variables and changed the EOC to trigger on changing avatars, so there's no need anymore for a recurring EOC.