pqWidgetTestEventPlayer adds the widget-level commands the UI tests were
missing:
- screenshot grabs the addressed widget and saves it, creating the parent
directory and expanding $NAME / ${NAME} from the environment so the runner
decides where captures land
- dumpTree writes the widget paths the tests address, for finding the path of a
widget while writing a test
- resize sets the top-level window size, since the layout owns the children
The runner sets COCKATRICE_SCREENSHOT_DIR to build/screenshots, which is
ignored, so captures do not show up as untracked files.
Testing/screenshot_test.xml captures the main window and the settings dialog,
and Testing/README.md documents the commands, the pause/process_events split,
path drift and the capture workflow.
