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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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
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).