Improvement + Fix: Ashfang Features with Mob Detection

[ItsEmpa]

Dependencies

• #2096

What

Refactors basically the entirety of the Ashfang features to use mob detection and a cleaner code style, and adds things like having the text on the gravity orbs and blaze souls be adjusted with distance.

Changelog Improvements

• Improved various Ashfang features. - Empa

Changelog Fixes

• Fixed Ashfang Blazes sometimes being highlighted with the wrong color. - Empa

Changelog Technical Details

• Added EntityLeaveWorldEvent. - Empa