graphical/non-graphical user interface without external programs

Changes for 0.39 - 2023-07-30T07:43:21Z

• fixed failing test with Term::ReadLine::Gnu >= 1.46 in t/51-rich-term.t
• made DoD script useable for other projects
• made language support script useable for other projects
• removed hopefully obsolete workaround for coverage
• fixed typo in message in test 51
• skipping some broken tests on Windows/Cygwin
• further fixes for display of Listbox in PoorTerm
• initial tests now report terminal size as some smokers have very small ones