Need force shutdown of the System Under Test

[eostermueller]

If the System Under Test (SUT) only partially launches, there's no convenient way to recover.
For example, this shows that the sutApp never started, even though H2 and Wiremock did start.
The cause here? Compilation error in sutApp.

Because the SUT startup checkbox is enabled in mid-startup, there's no way to shut down the parts that did start, and no way to complete the startup.
Must open command prompt and manually kill processes.

To implement, create "SUT Force Shutdown" button.
Can't quite decide whether it should be placed somewhere prominently, or somewhat hidden / out of the way, or only displayed when snail4j "detects" it is needed. For example, it would be needed when the SUT doesn't launch within a timeout -- perhaps a 20 second timeout.