Connected Villager Job Site [DATA PACK]

Cleaned up the code and changed the Job Site highlight a bit. Changes are:

-Code cleaner and more efficient - there shouldn't be much to improve from this point forward;

-Entity used for the Job Site highlight changed from Shulker to Magma Cube so that the head doesn't shows after invisibility effect is applied;

-Changed the entity spawning positioning logic of the entity - Shulkers are always spawned centered in the block, so the spawning logic had to be changed for the Magma Cube;

-Added No Collision for the entity used for the Job Site highlight so that it doesn't pushes other entities away;

-Deleted some old unused files;

-Removed debug lines from code as I deemed they won't be necessary anymore;

-Pack format changed to 5 as of 1.15.