rework 1D import dialog (#729)

Joachim Wuttkerequested to merge
i729b into main
  • Terminate support for specific legacy formats
  • Support .dat.gz extension
  • Remove unused separator property
  • Along with legacy import dialog, popup a window that displays the file content
  • Move (de)compression code to separate namespace
  • Simplify filename conversion for Windows (new fct osPath)

This resolves #729 (closed).

Edited by Joachim Wuttke

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