Tidy advanced gui panel (PR #9239)
* Make the warning bigger, and wrap the long text explaining the dialog.
* Add checkbox to enable the advanced controls
- This helps to ensure that users are aware of what they are changing.
- api.processPendingEvents is used before calling enable on the panel containing the controls, otherwise NVDA had a mismatch
with the reported and actual state of the checkbox.
* Add a restore defaults button to the advanced panel.
- This allows users who have previously changed settings, restore them to recommended settings.
* Change settings panels to use role "property page"
- Now when they get focus they are announced as "general property page"
* Speak extra info on advanced and document formatting categories.
- This is essentially a property page description. It is the static text at the start of the panel.
* Created a simplified, reusable acc prop server
- Takes a mapping of the prop and value to override.
* Fix multi-instance error for settings dialog.
- No longer stop a user from accessing settings when there is a destroyed but not deleted window. Instead
raise an error. Also check for this error on when terminating the GUI.
* Override the description property for the NVDA settings dialog
- Overriding with an empty description so that panel descriptions are not
reported twice (when getDialogText runs). The panel descriptions are still
reported when the panel gets focus.
