CS
Moved product collection into model namespace
Use methods instead of properties
Use static Contao library methods
Fixed namespace issue
Use static access to Contao configuration object
Added findByFallback and findByRootPageOrFallback methods to config model
All methods in Isotope object are now static
Use static methods of Isotope class
CS
Use static Contao Config object
Enable relations for tl_iso_collection.source_collection_id
Fixed namespace issues