Bug fix and optimization for item requirements during rank up logic
 Fixed damageable library import
 
 Example config for potions:
 
 Potion Item ID : amount required
 splash_potion{Potion:strong_healing}:1
 
 Item IDs can be found at 
https://minecraftitemids.com/
 
 Full example of Cost in a rank:
 
 
 
 
  Code (Text):
 
 
 
  Rank1:
  
   Cost: ["splash_potion{Potion:strong_healing}:1",Economy:50,Diamond:1,JobsReborn:Woodcutter:1,mcMMO:Mining:1,Custom:10]