#784 Perform bypass purge permission check with OfflinePlayer objects

- Move permission check inside PurgeTask to perform it with OfflinePlayer objects instead of lowercase names
- Move purge members into child "purge" package
- Unify online and offline default permission behavior in DefaultPermission

src/main/java/fr/xephi/authme/permission/PermissionsManager.java

@@ -12,6 +12,7 @@ import fr.xephi.authme.permission.handlers.VaultHandler;
 import fr.xephi.authme.permission.handlers.ZPermissionsHandler;
 import fr.xephi.authme.util.StringUtils;
 import org.anjocaido.groupmanager.GroupManager;
+import org.bukkit.OfflinePlayer;
 import org.bukkit.Server;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
@@ -210,22 +211,33 @@ public class PermissionsManager implements Reloadable {
      * Check if a player has permission for the given permission node. This is for offline player checks. If no permissions
      * system is used, then the player will not have permission.
      *
-     * @param name           The name of the player.
-     * @param permissionNode The permission node to verify.
+     * @param player         The offline player
+     * @param permissionNode The permission node to verify
      *
-     * @return
+     * @return true if the player has permission, false otherwise
      */
-    public boolean hasPermissionOffline(String name, PermissionNode permissionNode) {
+    public boolean hasPermissionOffline(OfflinePlayer player, PermissionNode permissionNode) {
         // Check if the permission node is null
         if (permissionNode == null) {
             return true;
         }
 
         if (!isEnabled()) {
-            return permissionNode.getDefaultPermission().evaluateOffline(name);
+            return permissionNode.getDefaultPermission().evaluate(player);
         }
 
-        return handler.hasPermission(name, permissionNode);
+        return handler.hasPermissionOffline(player.getName(), permissionNode);
+    }
+
+    public boolean hasPermissionOffline(String name, PermissionNode permissionNode) {
+        if (permissionNode == null) {
+            return true;
+        }
+        if (!isEnabled()) {
+            return permissionNode.getDefaultPermission().evaluate(null);
+        }
+
+        return handler.hasPermissionOffline(name, permissionNode);
     }
 
     /**