Splits Gate into Gate, GateLayout and GateHandler, and creates a new portal package with portal related classes

src/main/java/net/knarcraft/stargate/BlockLocation.java

@@ -202,9 +202,12 @@ public class BlockLocation extends Location {
 
     @Override
     public boolean equals(Object obj) {
-        if (this == obj) return true;
-        if (obj == null) return false;
-        if (getClass() != obj.getClass()) return false;
+        if (this == obj) {
+            return true;
+        }
+        if (obj == null || getClass() != obj.getClass()) {
+            return false;
+        }
 
         BlockLocation blockLocation = (BlockLocation) obj;