Little change to allays to handle them easier

This is a little rework idea for allays to handle them easier:

• The allays should fly around the jukebox when a disc is playing music and only move away when a note block is played (or the music is stopped) - but after 30sec next the note block they return to the jukebox again. 

• When the player wants the allays to follow him he needs to stop the music from the jukebox or tie them up with a lead. Here I want to mention that the music disc should not stop playing when the player is not near the block (but it shouldn’t load junks it only should keep the allays). 
  
  
• The allay always drops the item he collects next by the player except when a note block is played (like it is now).

This would help the players to not loose the allays and to control them easily.