Improve generic quests

I'll be adding more functionality and simplifying some existing functionality for generic quests. Eg

- The same quest giver can have multiple quests
- The same quest can consist of multiple actions, eg you retrieve one or multiple items, visit one or multiple places
- A quest ping feature that tracks quest progress or lets the player know they're near
- Simpler quest setup in the toolset, eg NPCs you need to talk to as part of the quest are stored in the quest giver's vars as their names, so everything's neatly stored in one place and you can just search in the toolset for the right NPC

I'll be leaving the existing ee_generic_quest as legacy, and injecting the new functionality with an Anvil script handler. People can use the legacied quest setup if they wish, I'll be documenting both on Outline.

Codewise C# is required for splitting and parsing the local vars that are used to set up the quests in the quest NPC's