Add ClearPermission method to PermissionManager

Author: himenekocn

managed/src/SwiftlyS2.Core/Modules/Permissions/PermissionManager.cs

@@ -251,4 +251,14 @@ public void RemoveSubPermission( string permission, string subPermission )
 
     _queryCache = _queryCache.Clear();
   }
-}
+
+  public void ClearPermission( ulong playerId )
+  {
+    lock (_lock)
+    {
+      _temporaryPlayerPermissions.Remove(playerId);
+    }
+
+    _queryCache = _queryCache.Clear();
+  }
+}