Nextcloudtasks

Added
- Nearly complete rewrite for oC9 support
- Tasks is now a CalDAV client and uses the CalDAV server built into oC core
- It is a Standalone app now!
- Reminder, Comments and Search is not yet implemented, this will come with the next releases
- parse links in title, notes and comments
- temporally show subtasks when parent task is opened

Added
- increase compatible version for oC8.2

Added
- implement support for subtasks (click on the plus icon to add a subtask or drag and drop a task)
- reworked drag and drop support (change lists and make tasks a subtask)
- faster app loading
- custom favicon
- improved backend code

Fixed
- several style improvements and fixes
- fixed search

Fixed
- fix update script

Added
- requires oC8.1
- supports categories
- supports finer priorities
- adapts to owncloud look

Fixed
- fixes problems with escaping of commata and semicolons

Added
- works with oC8
- implement global oc search box

Fixed
- fix problems with other task clients ("Mirakel" and "eM Client")
- fix problems with reminder
- fix problems with comments in the TaskSync Android App