Make `PrintVariablesToFile` and `PrintVariables` to print the first line with a correct TSV format

[DrkWzrd]

Your Feature Request

Right now these two methods prints the first line with a single part

Tesseract parameters:

this breaks most of the tsv/csv readers trying to infer the column count from the first line.

It will be better to print something like

"Variable name" Value Description

tab separated headers, allowing the readers to handle this gracefully.