src: utils: WIP script to create chapter files for mkvmerge.
src: utils: simplechaps: Minor refactoring.
src: utils: simplechaps: Add docstring.
src: utils: simplechaps: Make simpler and passing the tests.
src: utils: simplechaps: Update docstring.
src: utils: simplechaps: Simplify list comprehension.
src: simplechaps: Simplify usage instructions.
src: utils: simplechaps: Make the script more robust.