add support for Text importing / Skipping N lines in the csv file

Слиты nikitronn запросил слияние text_in_plus_mods в master

Created by: zeffii

Addressed problem description

To allow more generic csv input, it is necessary to add a way to skip a number of introduction lines in the file. I also wanted a way to import the File from the node UI.

Solution description

  • add a file Import Operator to optionally load the file from node UI
  • add a intproperty, default to 0, which skips n intro lines if the property is adjusted beyond zero.

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Preflight checklist

  • Code changes complete.
  • Code documentation complete.
  • Documentation for users complete (or not required, if user never sees these changes).
  • Manual testing done.
  • Unit-tests implemented.
  • Ready for merge.