* optional reserve base64 string in markdown _CustomMarkdownify and pptx * add other converter para support * fix linter * Use *kwarg to pass keep_data_uri para. * Add module cli vector tests * Fixed formatting, and adjusted tests.
* optional reserve base64 string in markdown _CustomMarkdownify and pptx * add other converter para support * fix linter * Use *kwarg to pass keep_data_uri para. * Add module cli vector tests * Fixed formatting, and adjusted tests.