Remove gamemode and flying switching

Fixes Xephi/AuthMeReloaded#355
Fixes Xephi/AuthMeReloaded#320
Fixes Xephi/AuthMeReloaded#258
Fixes Xephi/AuthMeReloaded#246

src/main/java/fr/xephi/authme/util/Utils.java

@@ -7,10 +7,9 @@ import fr.xephi.authme.cache.limbo.LimboCache;
 import fr.xephi.authme.cache.limbo.LimboPlayer;
 import fr.xephi.authme.events.AuthMeTeleportEvent;
 import fr.xephi.authme.permission.PermissionsManager;
-import fr.xephi.authme.permission.PlayerPermission;
 import fr.xephi.authme.settings.Settings;
+
 import org.bukkit.Bukkit;
-import org.bukkit.GameMode;
 import org.bukkit.Location;
 import org.bukkit.World;
 import org.bukkit.entity.Player;
@@ -195,17 +194,6 @@ public final class Utils {
         });
     }
 
-    /**
-     * Force the game mode of a player.
-     *
-     * @param player the player to modify.
-     */
-    public static void forceGM(Player player) {
-        if (!plugin.getPermissionsManager().hasPermission(player, PlayerPermission.BYPASS_FORCE_SURVIVAL)) {
-            player.setGameMode(GameMode.SURVIVAL);
-        }
-    }
-
     /**
      * Safe way to retrieve the list of online players from the server. Depending on the
      * implementation of the server, either an array of {@link Player} instances is being returned,