* fixed wrong indizes for gem color picker in locale 3 (deDE)
* fixed interpretation of filter enums. Some are providing their value directly, others have an intermediate key.
* createSQLForCriterium is no longer abstract. (was implemented in exactly the same way everywhere)
* erronous criteria are now logged and discarded entirely)
* vastly improved input validation
* content and type validation occurs when filter is created
* contextual filters like itemTypes are now only applied in context
* initial implementation
* this includes a complete reindexing of everything touching icons
* this also means, no linking to red-rocket-site though, they index them differently