The CMakeLists.txt now (almost) supports both qt5 and qt6 (for qt6, qt5_add_translation must be replaced by the proper one). The compilation instructions were not up to date, they have been updated.

People who have never seen GitLab may not stumble across the wiki on a
quick look.

... because it is now so prominently displayed and the first thing a
user see on the project page.

Extend the TerminalView's context menu with a 'clear' entry. Add German translation for welcome text

Better missing values warning and readme, Save As next to Save, an Info text which file is loaded, and some process status messages

Initial commit with a layout managed sketch for the main window, a logging window, message- and error-display, some sizing settings, and a first iteration of the qmake file.