* move checks to __construct so they can be run on $_POST data
and don't create malformed filter urls
* if we received malformed $_GET params, build new params and reload
* do not store error state in cache
* cleanup
* create php classes, each mirroring a js object
* each frontend class implements __toString and json_serialize and as such can be directly used by the template
* also allows for sane object creation before js screams in agony
* usage TBD