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/src/main/java/mage/abilities/effects/Effects.java

@@ -90,7 +90,7 @@ public class Effects extends ArrayList<Effect> {
                 !lastRule.startsWith("<b>Level ") &&
                 !lastRule.endsWith(".)") &&
                 !lastRule.endsWith("</i>") ) {
-            sbText.append(".");
+            sbText.append('.');
         }
         return sbText.toString();
     }