Fixes type of associated texts for product attributes
Deprecates isCachable() method as caching is done internally
Fixes retrieving associated texts, media, etc. for all items
Fixes bugs uncovered while testing for tags
Implements tests for cache tags and expiration dates
Improves caching for catalog stage client and adapts interfaces of remaining catalog clients
Adapts account clients to modified interfaces
Adapts basket clients to modified interfaces
Adapts checkout clients to modified interfaces
Adapts common html clients to modified interfaces