API improvements around Executor/Executable

Additional change suggestions on top of PR 1610

IIUC, the expectation here is that Queue.Executable will instantiate AsynchronousException as a handle, start something asynchronously (say send a JMS message) with a callback, and the callback will tickle AsynchronousException.

So AsynchronousException might complete before it gets its executor set. This code change ensures that that case gets handled correctly.

Fixed spelling errors in existing Polish translations.

Long-running executions can ignore shutdown events.

typo in .editorconfig