Added rudimentary support for disguising Custom Entities and Modded Entities

Added the DisguiseType 'Unknown', obviously can't be used by players
Cleaned up code

src/main/java/me/libraryaddict/disguise/utilities/BaseDisguiseCommand.java

@@ -345,6 +345,9 @@ public abstract class BaseDisguiseCommand implements CommandExecutor {
                 throw new DisguiseParseException(ChatColor.RED + "Error! The disguise " + ChatColor.GREEN + args[0]
                         + ChatColor.RED + " doesn't exist!");
             }
+            if (disguiseType.isUnknown()) {
+                throw new DisguiseParseException(ChatColor.RED + "Error! You cannot disguise as " + ChatColor.GREEN + "Unknown!");
+            }
             if (disguiseType.getEntityType() == null) {
                 throw new DisguiseParseException(ChatColor.RED + "Error! This version of minecraft does not have that disguise!");
             }

src/main/java/me/libraryaddict/disguise/utilities/DisguiseUtilities.java

@@ -970,6 +970,7 @@ public class DisguiseUtilities {
 
     /**
      * Setup it so he can see himself when disguised
+     * @param disguise
      */
     public static void setupFakeDisguise(final Disguise disguise) {
         Entity e = disguise.getEntity();

src/main/java/me/libraryaddict/disguise/utilities/DisguiseValues.java

@@ -52,6 +52,7 @@ public class DisguiseValues {
     private HashMap<Integer, Object> metaValues = new HashMap<>();
     private Class nmsEntityClass;
 
+    @SuppressWarnings("LeakingThisInConstructor")
     public DisguiseValues(DisguiseType type, Class classType, int entitySize, double maxHealth) {
         values.put(type, this);
         enumEntitySize = entitySize;