added some inline variable type hints / fixed some doc blocks

core/API/DataTableManipulator/LabelFilter.php

core/Controller.php

core/DataTableVisualization.php

core/Db.php

core/Log.php

core/Period.php

core/PluginsArchiver.php

core/PluginsManager.php

core/TaskScheduler.php

core/Tracker/Db/Pdo/Mysql.php

core/Visualization/Sparkline.php

plugins/API/RowEvolution.php

plugins/ImageGraph/API.php

plugins/ImageGraph/StaticGraph.php

plugins/ImageGraph/StaticGraph/PieGraph.php

plugins/Live/API.php

plugins/MultiSites/javascripts/multiSites.js

plugins/Referers/API.php

plugins/SEO/Controller.php

plugins/Transitions/API.php