Quarantine event

Initial implementation for #27 

I am not able to figure out why it's not able to read a database from the disk when command line utility works.

sqlite3 /Users/$USER/Library/Preferences/com.apple.LaunchServices.QuarantineEventsV2 'SELECT * FROM sqlite_master WHERE type="table";'

sqlite3 /Users/$USER/Library/Preferences/com.apple.LaunchServices.QuarantineEventsV2 'SELECT * FROM LSQuarantineEvent'

Are working fine - but reading from code again crashes.

P.S.: I am sorry - I have to figure out how can I get rid off  that crontab.
There is a function in Objective-C++ (users.mm) which is retrieving all users. But I don't know Objective-C++ - so I have used this simplification to somehow continue. It should be replaced with some better function.