PyMuPDF 1.18.13

Rewritten method `Page.insert_image`

on Python PyPI

Method Page.insert_image has been rewritten for improved performance in standard cases. Also introduced option to re-use pre-existing images in the file directly to provide another performance boost.
Other changes:

• implemented or fixed #1042, #1041, #1037
• minor improvements in PDF EmbeddedFiles handling for better support of building PDF collections apps.