Add utilities for reading text files and csv files

The function `read_text_file(…)` will read the raw text file and
return the content line by line.

The function `read_csv_file(…)` builds on `read_text_file(…)` to read
a file as a character-separated-values file. The field separator, and
comment_char characters can be provided to customise how the CSV file
is read.

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