- Refactor code to use sync.UniqueQueue
- Closes #3509

These are to follow the GNU Coding Standards Makefile Targets:
https://www.gnu.org/prep/standards/html_node/Standard-Targets.html

* Can use a predefined set of labels

* Change UI

* Fix HTML file indentation

* Avoid reading file from other directory (security issue)

* Apply a better fix

* Remove not used variable

* Merge upstream/develop

* Do modifications

* Raname

* remove binding + rename variable

[CI SKIP]

Git convention has it capitalised.

- Closes #3488