MakerFarm Prusa i3 Magma cooling system remix

This is a remix of the original cooling system by thiagokunz, which is a must-have for anyone with the Prusa i3 from MakerFarm with the Magma hot end. The differences here from the original:
1. Allowed slightly more fit tolerance between pieces
2. Added retainer clip for wedge (back) piece
3. Added bolt through-holes for easier removal
4. Added the new fan cover as-is with a 90 degree rotation for printing

The main feature is the bolt through-holes, which allow you to remove the entir