Added removing of unallowed characters from course names. Thus problems with filesystems are prevented.
Fixed Constructor of structurelement.
Refactoring of filedownloader
Fixed bug in creation of directories
Fixed a bug in setting the last modified date for files and other minor improvements.
Added label showing download speed.
Updated README.md
Added display for downloadspeed
Itemmodel of browser get saved and loaded to/from harddisk.
Color for synchronised elements changed.
Feature added to merge two itemModel. Thus permanent exclusion of files is possible.
Removed option to use original last modified date. Now it is activated permanently
Fixed bug that prevented loading the refreshToken from harddisk