feat(UtiDb): make class public

This is necessary so that a user can add additional XML definitions.

src/net/psexton/libuti/UtiDb.java

@@ -37,7 +37,7 @@
  *
  * @author psexton
  */
-class UtiDb {
+public class UtiDb {
     // Singleton stuff
     private static class SingletonHolder { public static final UtiDb instance = new UtiDb(true); }
     public static UtiDb getInstance() { return SingletonHolder.instance; }