Added tag kind getter to tag model and renamed file template tag.
Improved type conversion utils.
Refactored tag utils hierarchy (moved generic utils to Tags, added basic utils).
Fixed tag value update, refactored the "value" property into normal attribute.
Fixed concurrency bug in InMem database.
Added statistical DB test with random insert, update and delete operations.
Fixed transaction changelog bug in InMem database.
Improved InMem changelog operations (executing only inside transactions).
Fixed record update in InMem (proper record ID update).