Merge pull request #158 from deniskoronchik/dev-lock

[sc-memory] Implement access levels in iterators (issue #157)
[sc-memory] Add acces levels check into events (issue #159)
[sc-memory] Fix deadlock in events access check.
[sc-memory] Setup minimal read and maximum write access level on sc_helper initialization
[sc-builder] Setup minimal access level to data that generated with builder