Version 1.4.0

* Switch to NetBeans 11.2
* Run maven in single thread since multithread throws a NullPointerException

Update plugin-updateurl

New version, add support for submission result status "hidden"

New version 1.2.4

New version 1.2.3

New version

New version 1.2.1

Fix organization- and courselistwindows' visual bugs

Update travis.yml to Netbeans 8.2

Add soft deadline support for exercises