[NSM] add support of OnlyOneLevelFileListing
[NSM DBox] skeleton of dropbox plugin
[NSM] add methods for loading child items
[NSM GDrive] add dummy methods for per level items loading
[NSM DBox] add access to directories and its content
[NSM] remove unused methods
[NSM] remove debug string
[NSM DBox] add getting media link to file
[NSM] Remove parameter from gotFileUrl
[NSM GDrive] Update account to updated interface
[NSM DBox] Add getting account info and share url methods
[NSM] Update core to updated interface
[NSM] remove CurrentDirectoryID,use LastParentID
[NSM DBox] update style and remove unused code
[NSM GDrive] emit listingUpdated on changes in listing
[NSM DBox] removing items
[NSM] style fixs
[NSM DBox] copy and move
[NSM] remove moved ids from items
[NSM DBox] uploading files less then 150Mb