DataSpace Sync Client Release 2.0.2

UI-Bugfixes:
* Upload status of a file is recalculated if the file grows while reading the file
      Fixes mantis issue 4032
* Linux: Cropped text in setup dialog
      Fixes mantis issue 3435
Improved error handling for non UTF-8 supporting backends
      Fixes mantis issue 4331

Merge branch 'rc/2.0.2'
Implemented a notification mechanism to show needed interactions