Task asynchronous code does not work during startup or shutdown

[daniel-lerch]

Steps to reproduce:

1. Start a long running task on application exit
2. Let the message loop terminate
3. Wait for the long running task to finish

Expected behavior:

• The task finishes within a few seconds and the process exists

Actual behavior:

• The task never finishes likely due to a deadlock

Additional context:

• Making the Main method async does not fulfill Windows Forms' requirements of a single-threaded apartment
• Using Application.Run() without a main form and the Application.Idle event for further initialization work might be an option