All 1-character strings converted to primitives

"b" + "r" now changed to 'b' + 'w'.  It's more straight-forward, and may cause perfomance improvements - character primitives allocation is faster and less expensive than string creation.

Mage.Client/src/main/java/mage/client/components/layout/RelativeLayout.java

@@ -802,6 +802,6 @@ public class RelativeLayout implements LayoutManager2, java.io.Serializable {
         return getClass().getName()
                 + "[axis=" + axis
                 + ",gap=" + gap
-                + "]";
+                + ']';
     }
 }