calibre 7.20 released

New features

• PDF Input: Automatic header/footer detection and removal
• Read Aloud: Allow configuring an extra pause at the end of every sentence when using the Piper TTS engine
• PDF Output: Add WIDTH_PIXELS and HEIGHT_PIXELS variables to know the width and height of the header/footer area in templates
• Windows: Use calibre's bundled SSL certificates instead of the system certificate store by default
• Trim image tool: Add a control to adjust aspect ratio
• Kobo driver: Add support for the new firmware used by the Tolino Shine 5