API CHANGE: Moved ManifestBuilder::get_themes() to SSViewer::get_themes(). (copied from 5c972b231d00117ca0cf4a32d08b59ed760256c6)
API CHANGE: Moved ManifestBuilder::get_themes() to SSViewer::get_themes(). (copied from 5c972b231d00117ca0cf4a32d08b59ed760256c6)

dhensby/silverstripe-reports,dhensby/silverstripe-cms,silverstripe-labs/silverstripe-reports,silverstripe/silverstripe-cms,jonom/silverstripe-cms,dhensby/silverstripe-cms,jonom/silverstripe-cms,dhensby/silverstripe-reports,silverstripe/silverstripe-siteconfig,silverstripe-labs/silverstripe-reports,helpfulrobot/i-lateral-silverstripe-siteconfig,silverstripe/silverstripe-cms,dhensby/silverstripe-cms