Refactor slightly count number of lines script

Prepare Markdown output for the aggregated results (easier to convert into pdf)
Fix the bad outputs (GLSL for instance due to few geo files found)
Refactor the script to count more properly Markdown files - in earlier version only the content of Sources directory was considered. Some Markdown files are not counted as code (ChangeLog, help to upgrade).

Edited Nov 21, 2022 by GILLES Sebastien

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