Code householding - remove legacy settings and TODO messages

- Remove fields in legacy settings that are now unused
- Remove various irrelevant todo messages
- Reduce visibility on some elements

src/main/java/fr/xephi/authme/process/register/ProcessSyncEmailRegister.java

@@ -37,7 +37,7 @@ public class ProcessSyncEmailRegister implements SynchronousProcess {
     @Inject
     private AuthMe authMe;
 
-    public ProcessSyncEmailRegister() { }
+    ProcessSyncEmailRegister() { }
 
     public void processEmailRegister(Player player) {
         final String name = player.getName().toLowerCase();