Mob AI Tweaks

-The Wither now does a spin attack when dashing, solely to match its hitbox.

-The Wither's explosions created by its dash are now raised slightly higher to make the hitbox more forgiving to dodge.

-Fixed the Wither's janky yaw rotation.

-Fixed Wither Skeletons turning completely black before shooting their skulls.

-Fixed invisible mobs issue caused by burn and freeze visuals.

-Fixed the player being invisible when set on fire.