High Scores screen, allow deleting an existing entry in the list

[LeHerosInconnu]

In fheroes2, it would be nice to be able to delete an existing entry in the list.
For example, I sometimes run tests and these entries "pollute" the high scores list.

This could be done by a left click on one of the entries, which would open a window offering the option of deleting that entry from the list.
To avoid unwanted deletions, the user should also be prompted to confirm the action.

In fheroes2: