* hardcode sql limits within their respective components instead of
having them configurable
* creating a new DBTypeList defaults it to being unlimited
* SQL_LIMIT_NONE (0) > removed as it only existed for consistency
* SQL_LIMIT_DEFAULT (300) > frontend / Listview::DEFAULT_SIZE
* SQL_LIMIT_SEARCH (500) > Search::DEFAULT_MAX_RESULTS
* SQL_LIMIT_QUICKSEARCH (10) > Search::SUGGESTIONS_MAX_RESULTS
* 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
* fix cache id collision when category == dbTypeId for a given dbType
* increment version number to invalidate existing caches
* maps endpoint doesn't need caching. It is entirely static content.
