Undead Unleashed - Continued

- increased wraith spawn weight/chance,
- fixed mobs spawning in deep dark,
-  changes to dreadknights: , increased movement speed, slightly modified entity model and texture, lightly raised height hitbox, minor change to the idle animation

1.20.1 only:

- fixed dreadknights still spawning on mushroom fields

- fixed dreadknights being stuck in an attack animations after quitting and rejoining the world
- fixed wraiths not being properly tagged as undead