Added ability to check if the instance of the object is stored in the…

… container

Add functionality to discard all instances in container

Add new registry role - provisional instance

Names refactoring

Make registry item completely public

Give access to internal registry to allow fine tuning if needed

Refactoring, allow to discard resolved singleton instance and produce…

… new on next resolution

Use serial queue for access sync

Fix sync lock issue

Fixed some synchronisation issues