Compress-pptx

* Migrate to magick commands.

* Add CLI option for num_cpus.

* Formatting and fix path handling.

* Bump requirement to python 3.8.

* Docs: add caydey as a contributor.

* Update README and minor code changes.

* Added '-l' to compress emf files using libreoffice.

* Fixed bug for when file compression fails.

* Fixed bug with clashing variable names.

* Refractored "image" to "file"

* Media file compression and recompress jpeg files.

* Remove manifest.in.

* Update python requirements.