v2.0.0-beta.4

Upstream changes (picked from the stable release channel):

• Enable the following macOS related features (#50):
  • Basic app window menu.
  • Cmd+h command.
  • Showing app window on dock icon click.
• Disable portable builds (#60).

This release changes:

• [tutanota] Make reactive local cache update work again by supporting Tutanota WebClient change (#61).
• [protonmail] Display "all mail" and "starred" folders as system folders.
• Enable basic "load more" feature with portion size set to 50 (#55).
• Display conversations collapsed by default.
• Enable emails export to EML files, related notes:
  • App exports emails in their original form, unencrypted and unsanitized.
  • Attachments are ignored during export.

Previous beta releases: v2.0.0-beta.1, v2.0.0-beta.2, v2.0.0-beta.3.