Testing - change to non-reflection WrapperMock test setup

Replaced many classes to use Wrapper to get singletons and replaced the test setups to use the WrapperMock instead of setting fields through reflection

src/test/java/fr/xephi/authme/util/WrapperMock.java

@@ -1,6 +1,7 @@
 package fr.xephi.authme.util;
 
 import fr.xephi.authme.AuthMe;
+import fr.xephi.authme.cache.auth.PlayerCache;
 import fr.xephi.authme.settings.Messages;
 import org.bukkit.Server;
 import org.bukkit.scheduler.BukkitScheduler;
@@ -72,6 +73,11 @@ public class WrapperMock extends Wrapper {
         return getMock(Messages.class);
     }
 
+    @Override
+    public PlayerCache getPlayerCache() {
+        return getMock(PlayerCache.class);
+    }
+
     @Override
     public File getDataFolder() {
         if (singleton.getDataFolderValue != null) {