[] use a composite job for multiple files
https://bugs.kde.org/show_bug.cgi?id=390876
[] support .part files
https://bugs.kde.org/show_bug.cgi?id=351063
[x] Make filetranfer abortable
https://bugs.kde.org/show_bug.cgi?id=349956
[x] Show a progress bar when sending a file to phone on the desktop
https://bugs.kde.org/show_bug.cgi?id=355044
[] Drag and Drop filetransfer