Copy value from struct to struct and more (library)

 Library for deep copying complex datastructures in golang.
 Features:
   • Copy from field to field with same name
   • Copy from method to field with same name
   • Copy from field to method with same name
   • Copy from slice to slice
   • Copy from struct to slice
   • Copy from map to map
   • Enforce copying a field with a tag
   • Ignore a field with a tag