Parameters not working

Tested on XWiki 15.10, 18.3.0 with version 1.4.4 Kanban. Does not reproduce on 1.4.3.

There's an extra + after the macro, and the addItemButton, removeItemButton, etc.. parameters are not respected (they should be false, but the buttons are rendered). I think it's because the new escapes will turn the false parameter value into a "false" string, which is then interpreted as true in the kanban code.

There's also some errors/deprecation warnings for the jQuery.getJSON().error() method, which is deprecated in favor of .fail()