added method to BaseCloudCtrl that lists project zip files in projects folder in cloud storage
added download file method to BaseCloudCtrl
changed download file method to skip downloading files if the same file already exists at the same local path
added downloading image files used by the imported project
added signals to update ui on progress
added menu action and empty slot for importing project
merged dev into gns-59
added project import dialog
fixed tests broken by 9d0bd31
added delete cloud project option
Merge pull request #33 from planctechnologies/gns-60

GNS-60 Delete cloud project