Use injection in and for LimboCache, migrate some legacy settings, remove setGroup from Utils

- New injector method allows to retrieve services if they've already been instantiated -> useful for onDisable() which might be run after aborted initialization
- Deprecate various methods that need to be removed

src/main/java/fr/xephi/authme/process/logout/AsynchronousLogout.java

@@ -5,12 +5,12 @@ import fr.xephi.authme.cache.auth.PlayerCache;
 import fr.xephi.authme.cache.limbo.LimboCache;
 import fr.xephi.authme.datasource.DataSource;
 import fr.xephi.authme.output.MessageKey;
+import fr.xephi.authme.permission.AuthGroupType;
 import fr.xephi.authme.process.AsynchronousProcess;
 import fr.xephi.authme.process.ProcessService;
 import fr.xephi.authme.process.SyncProcessManager;
 import fr.xephi.authme.util.BukkitService;
 import fr.xephi.authme.util.Utils;
-import fr.xephi.authme.util.Utils.GroupType;
 import org.bukkit.entity.Player;
 
 import javax.inject.Inject;
@@ -63,7 +63,7 @@ public class AsynchronousLogout implements AsynchronousProcess {
             limboCache.deleteLimboPlayer(name);
         }
         limboCache.addLimboPlayer(player);
-        Utils.setGroup(player, GroupType.NOTLOGGEDIN);
+        service.setGroup(player, AuthGroupType.NOT_LOGGED_IN);
         syncProcessManager.processSyncPlayerLogout(player);
     }
 }