A class annotation used to make a class Comparable by multiple Comparators. As an example, given this class:
 @Sortable class Person {
     String first
     String last
     Integer born
 }
 
 The generated Groovy class will:
 Comparable interfacecompareTo method based on the first,
     last and born properties (priority ordering will be according
     to the ordering of property definition, highest first, unless 'includes' is used; in which case,
     priority will be according to the order given in the includes list)Comparator methods named comparatorByFirst,
     comparatorByLast and comparatorByBornComparable or @Sortable.