Remove static injections in ListenerService

- Get other classes via Inject annotation
- Remove no longer needed Utils methods (relates to #736)
- Create tests for ListenerService and AuthMeBlockListener
- Performance improvement: keep unrestricted names as Set instead of List for faster contains() method

src/test/java/fr/xephi/authme/settings/SpawnLoaderTest.java

@@ -12,8 +12,6 @@ import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.TemporaryFolder;
-import org.junit.runner.RunWith;
-import org.mockito.runners.MockitoJUnitRunner;
 
 import java.io.File;
 import java.io.IOException;
@@ -26,7 +24,6 @@ import static org.mockito.Mockito.mock;
 /**
  * Test for {@link SpawnLoader}.
  */
-@RunWith(MockitoJUnitRunner.class)
 public class SpawnLoaderTest {
 
     @Rule