Add instance entrances to directions

[fechan]

Entrances to dungeons and raids should be included in directions, in case you want to go to a location inside an instance from outside or vice versa. I think there's a table for these, and probably PlayerConditions associated with them as well.

[fechan]

Instance entrances used to be in the Map table but now they're not. There's a corpse coordinate attributes now, though. Either way, not helpful for this because those are the entrances within the instance. https://wowdev.wiki/DB/Map

Raids/dungeons appear in MapPOI though. Is there a way to differentiate these from other POIs? Is there a way to link these to their InstanceID?