Old text format importer about daru-io HOT 2 OPEN

I initially thought that just plainly using the CSV Importer with col_sep: '; ' option should be working. But, the Importer won't be able to ignore empty lines. After looking at one of the unicode tables, I think we'd also require this Importer support something like :start_row and :end_row (rather than :skiprows) to crop data in a better way.

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1. It is NOT a work for :csv importer, because this format is not valid CSV.
2. It does NOT need "skiprows" option, it needs to ignore comments (comments could be in between lines, not only at the beginning of the file, and also at the end of line with data).

I believe that :plaintext importer initially meant to be handler for this format, just not finished. So, let's probably enchance it?

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