v1.2012041414

Major addition: always show images from a given sender.

Changes:

• Use newer pywebview commit than released.
• Implement "window hacks" for cocoa.
• Tidy up the add contact form/contacts app.
• Fix contact option list in send app.
• Restore sleep inside main python when debug.
• Upgrade pywebview to 3.3.5.
• Offer to always allow images for a message in thread view.
• Implement allowed images in email text API.
• Add API to create/delete allowed image flags for an email.
• Add the allowed images database table/model.
• Remove Folder.get_email_header_parts.
• Fix save contacts call argument.
• Make keyboard column scrolling smoother & consistent.
• Scroll down to first open message on open thread.
• Remove sleep before starting app in dev.
• Actually remove pydash requirement.
• Tidy up logging module mess - always log to stderr.
• Add batch save contacts function and use when adding contacts.
• Store contacts from trash.
• More descriptive function name.
• Add get contacts API endpoint.
• Improve consistency of contacts module.
• Use functools LRU cache cache_clear.
• Replace pydash.memoize with functools.lru_cache.
• Fix scroll container on contacts app.