Defining "closing actions" in setting file and SettingsDialog

[pekkakaho]

In addition to filtering actions with RegExp, there could be another field for defining "closing actions". Those actions could be automatically used for "graful shutdown" of the SUT, as is possible in stopSystem(), instead of just killing the process.

[pekkakaho]

Closing actions can be defined in finishSequence(), but not yet in settings file.