Imported: Make Peass runnable with Java 16

[DaGeRe]

This issue has been imported from an old repository. It was originally created by @DaGeRe at 2021-10-18T08:42:12Z with number #45

Since the update to Java 16, powermock does not work anymore: https://github.com/DaGeRe/peass/actions/runs/1351543388 This should be fixed

[DaGeRe]

This comment has been imported from an old repository. It was originally created by @DaGeRe at 2021-10-20T13:59:55Z

For most of the cases, PowerMock could be replaced by mockito-inline, but for TestParallelMeasurement, which uses a part of Peass which starts new threads, this is not easily possible.

Like pointed out in https://stackoverflow.com/questions/68088576/using-powermock-in-jdk-16, I activated --illegal-access=permit.