Version 2.1 (UI 2)

Version 2.0 brought a new CLI-version of the app (see https://github.com/OpenFoxes/Tiny4Linux/milestone/1 & https://github.com/OpenFoxes/Tiny4Linux/releases/tag/v2.0.0). Also planned was a complete rework of the GUI. Those two features were separated to provide the CLI earlier. All improvements on the user interface were moved to this version 2.1.