Setting the world system version is actually an asynchronous task (which makes sense, considering it is a disk write operation) and must thus be awaited. For this, the API of WorldSystemVersion had to be changed. Its version property has been removed, in favor of get and set methods. The set method is asynchronous, while the get is synchronous.
A new unit test for the MigratorInitiator ensures the behavior works as intended.
UI corrections
Styling of buttons adjusted for improved readability.
Closes #320
API corrections
WorldSystemVersionhad to be changed. Itsversionproperty has been removed, in favor ofgetandsetmethods. Thesetmethod is asynchronous, while thegetis synchronous.MigratorInitiatorensures the behavior works as intended.UI corrections