Maintaining compatibility with old zenity version

[msmouni]

• The current code version has an implementation error when passing the option "icon-name"/"icon", the code adds the option value as an other argument: zenity --question --icon dialog-information for example.

• Currently when parsing the output of "zenity/kdialog" --version using SemVer::new() it will fail to parse it since it ends with '\n'

• Catching and returning "zenity/kdialog" errors will help to debug better when an error occurs