Version information for maintenance tool

IFW Version: 4.2.0, built with Qt 5.12.11.
Build date: Nov 8 2021
Installer Framework SHA1: 6e0029cf0d295b19f300e9eba1620bf8419e3308

Problem:

Maintenance tool installs Design Studio but does not create a desktop icon for it in ~/.local/share/applications

Currently one needs to go and fish it out of the filesystem where Qt is installed. (~/Qt/Tools/QtDesignStudio/bin/qtdesignstudio)

Desktop icons are created for Qt Creator and Qt Maintenance Tool. (there is also one there for Squish)

Expected behaviour:

Desktop icon is also created for Qt Design Studio so that it can be easily found and launched from the GUI of the Ubuntu desktop.