PB Nextcloud Client 0.98

Feature: Use a separate webDAV Class including etags to get the sync status. This should make the folder sync faster (#16)
Feature: Enhance logging by using leanings from other apps
Feature: After login the user can select where to store the files (#21)
Feature: Enhance tests if file is still available (#24)
Feature: When the login cannot be down show dialog to user what to do (#22)
Feature: Add bash script to enhance dev exp
Feature: Remove offline modus by easier method accessing the sqllite db

Change: Remove startFolder options
Change: Content is synced on startup if internet is available, otherwise the user can actualize a certain folder by clicked the button "actualize" in the menu.

Fix: Reduce raw pointer usage

UI: Delete not working "Cancel" Button on Progressbar (#2)
UI: Hide Panel on top
UI: Switch to ListView Framework from other apps to benefit from enhanced UI and cleaner functions.