refs #6045 #6049 added an event to collect visitor info and made sure the Piwik UI kinda works when most tracker plugins are disabled
refs #6045 #6049 the UI should now work even when none of those reporting / tracker plugins is enabled
refs #6045 fixing already core and pluginsTests, need to check diff of integration tests tmrw
refs #6045 now I understand why it was defined in postLoad. To make those widget entries appear first in the list
refs #6045 fixed some tests as due to the event the order of the live properties has changed
refs #6045 added description for event. also made sure if Referrers plugin is disabled first and activated later it will not crash the live API as there might be some visitors having no referrer type
Merge pull request #6071 from piwik/6045_hooksForLive

Use an event to collect visitor information and made sure UI works even when minimum plugins are enabled