implement server side restrictions

src/engine/Enum.java

@@ -2767,6 +2767,9 @@ public class Enum {
             return leadershipTypes[i];
         }
 
+        public boolean canJoin(AbstractCharacter character){
+            return this.requiredRaces.contains(character.absRace) && this.requiredClasses.contains(character.absPromotionClass) && this.sexRequired.contains(character.absGender);
+        }
     }
 
     public enum MinionClass {