v0.4.0

This is not a stable release don't expect things to work. Use at your own risk.

• Built using SailfishOSSDK-Beta-1611-Qt5-linux-64
• Tested on Sailfish OS 2.0.5.6 (Haapajoki)
• Major code refactor to use new Go QT bindings
• Viewing conversations now use native QAbstractList models which should
  improve performance
• Fix #45 The attachment directory is now configurable and can be changed to a
  location searched by the gallery
• Fix #6 and #57 Notifications no longer replace. There is a new notification
  for each message
• Fix #58 Incognito mode should be working again
• Fix #55 (partially) Add command line option for manually
  encrypting/decrypting database
• Add option to disable sharing contacts with Signal
• Fix #52 Enable quick scroll
• Add ability to resend messages
• Fix #63 Add support for numeric fingerprints
• Add CLI tool for adding extensions to attachment file names
• Add Dutch translation by d9h02f
• Add German translation by Nokius & bonanza123
• Notifications use chat instead of sms sound