[4.2.1] McMMO hook fix, Immediate LeafDecay, Fortune & Silk Touch support for OreSweeper

• Issues with McMMO compatibility should now be fixed. They were caused by a change in McMMO's experience.yml file where the parent section "Experience:" was changed to "Experience_Levels:", sorry it took me so long to solve the issue.
• Now there is a setting for immediate LeafDecay, just set "LeafDecay.speed" to "5" and the leaves will decay instantly. This setting will most likely change to LeafDecay.delay in the future, at the request of SlimeDog
  
• OreSweeper now supports silk touch and fortune pickaxe enchantments

As always let me know of ANY and ALL bugs you encounter. If you have any suggestions, I'd love to add them to my to-do list. Cheers!