nmtui: rewrite logging
Split TUI logfile to steps, in case search functions fails, log TUI DEBUG having screen after each keypress. In case step contains substeps, log names of substeps and the screens after each substep (as it used to be).
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Split TUI logfile to steps, in case search functions fails, log TUI DEBUG having screen after each keypress. In case step contains substeps, log names of substeps and the screens after each substep (as it used to be).