Capturing Steps with MDI

TestComposer supports the capture functionality with multiple scripts open at the same time.

When capturing steps while multiple test scripts are open in the GUI, remember however that a step is always captured to the currently active script, i.e. the script in the tab that has the focus.

Since the active script may be a different one that the script having initially opened the session to the test ports or the configured DUT, steps captured into a `foreign' tab cannot be executed.