Fix revives; improve dungeon exit flow

[longfruit]

Description

Fix "Internal Server Error" when reviving dead avatars.

• On scene transition, new EntityAvatar instances are created. Ensure dead avatars stay dead here by looking in fight prop cur HP.
• Avoid switching to dead avatars when leaving dungeons. On team wipe, revive and switch to the first avatar.
• Ignore AbilityMetaSetKilledState for EntityAvatar. Pretty sure this is not supposed to immediately reset dead avatars to full HP, because it will bug revivals.

Allow quitting from tower on team wipe.

Fix player becoming stranded in dungeons by teleporting away.

• DungeonSystem.exitDungeon normally teleports player out on exit. But when player quits a dungeon by teleporting on map, this causes double teleports:
  1. Teleport by DungeonSystem.exitDungeon
  2. Teleport by map waypoint
• This causes the player to get stranded. Fix it by having DungeonSystem.exitDungeon delay its teleport by 200ms. If map teleport happens, the delayed teleport is canceled.

Some befores/afters:

	Before	After
Team wipe
Teleporting from dungeon
Revive

Issues fixed by this PR

Type of changes

• Bug fix
• New feature
• Enhancement
• Documentation

Checklist:

• My code follows the style guidelines of this project
• My pull request is unique and no other pull requests have been opened for these changes
• I have read the Contributing note and Code of conduct
• I am responsible for any copyright issues with my code if it occurs in the future.

[KingRainbow44]

DOING GODS WORK RIGHT HERE
thanks for the GIFs too