Added: iMSCP_Events_Aggregator::getEventManager() method
Changed: Mail sent by the exception mail writer are now sent every 24 hours ( in context of an identical exception )
Changed: Exception writers are now lazy-loaded
Fixed: The Mail writer ignores the MAIL_WRITER_EXPIRY_TIME parameter
Rewritten: Handler for uncaught exceptions ( including writers )
(cherry picked from commit ae83b75)