Replace create_function calls with lambda functions.

core/DataTable/Renderer/Json.php

core/Piwik.php

core/Unzip/PclZip.php

core/View.php

plugins/API/API.php

plugins/Actions/API.php

plugins/CoreVisualizations/JqplotDataGenerator/Chart.php

plugins/CustomVariables/API.php

plugins/DevicesDetection/DevicesDetection.php

plugins/MultiSites/API.php

plugins/Referers/API.php

plugins/SitesManager/API.php

plugins/UserCountry/API.php