moved more logic from core to plugins

core/Db/Schema/Mysql.php

core/Plugin/Segment.php

core/Plugin/VisitDimension.php

core/Tracker/Settings.php

core/Tracker/Visit.php

plugins/API/API.php

plugins/Actions/Columns/EntryPageTitle.php

plugins/Actions/Columns/EntryPageUrl.php

plugins/Actions/Columns/ExitPageTitle.php

plugins/Actions/Columns/ExitPageUrl.php

plugins/Actions/Columns/VisitTotalActions.php

plugins/Actions/Columns/VisitTotalSearches.php

plugins/CoreHome/Columns/VisitFirstActionTime.php

plugins/CoreHome/Columns/VisitLastActionTime.php

plugins/CoreHome/Columns/VisitorDaysSinceFirst.php

plugins/CoreHome/Columns/VisitorDaysSinceOrder.php

plugins/CoreHome/Columns/VisitsCount.php

plugins/CoreHome/Segment.php

plugins/Events/Columns/TotalEvents.php

plugins/UserSettings/Columns/Language.php