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/common/SacrificeAllEffect.java

@@ -115,7 +115,7 @@ public class SacrificeAllEffect extends OneShotEffect {
         } else {
             sb.append(CardUtil.numberToText(amount.toString(), "a"));
         }
-        sb.append(" ");
+        sb.append(' ');
         sb.append(filter.getMessage());
         staticText = sb.toString();
     }