Braille Viewer: Add a close button on the title bar for use with pointing devices

[JulienCochuyt]

Link to issue number:

As argued IMHO with reason by @bhavyashah in #10791 (comment)
This PR does not address #10791 which targets Speech Viewer.

Summary of the issue:

The Braille Viewer currently presents no close control on its GUI.
It can only be closed with alt+F4 or by means of the dedicated NVDA Tools menu entry.

Description of how this pull request fixes the issue:

Add a standard close button on the title bar of the Braille Viewer dialog.

Testing strategy:

Ensured the dedicated check-able NVDA Tools menu entry gets unchecked as it properly does when closing the dialog with alt+F4.
Ensured proper behavior is maintained during restarts with or without "show at start-up" being checked.

Known issues with pull request:

Change log entries:

Changes
The Braille Viewer now has a standard close button for easier interaction with users of pointing devices. The other ways of interacting with this dialog remain otherwise unchanged.

Code Review Checklist:

• Pull Request description is up to date.
• Unit tests.
• System (end to end) tests.
• Manual tests.
• User Documentation.
• Change log entry.
• Context sensitive help for GUI changes.

[XLTechie]

This change IMHO does not deserve a change log entry.

I (mildly) disagree. Someone who has previously been frustrated by its absence, may like to learn that now it's there.

[alexarnaud]

I agree with @XLTechie, I think it could be useful for people to be aware of this new feature.

[JulienCochuyt]

@XLTechie, @alexarnaud,
Thanks for your feedback.
Please find a proposed change log entry in the updated description.
Glad you find this functionality useful.

[XLTechie]

Can it also be reached by keyboard nav (either standard or braille)?
If so, I would suggest the following for changes:

The Braille Viewer now includes a visible close button for added convenience.

[JulienCochuyt]

@XLTechie wrote:

Can it also be reached by keyboard nav (either standard or braille)?

Only through object navigation. It is a standard dialog close button positioned at the right of the title bar and has no special UX whatsoever. It's sole intent is to be activated using a pointing device such as mouse or touch screen.

Still, feel of course really free to propose a better wording of the change log entry than the one I quickly wrote.
I'm not a native English speaker.

[seanbudd]

LGTM, thanks @JulienCochuyt!