sailfish-webview and friends

Merged a couple of forks and added sailfish webview auth.
(Warning, this last one only works from terminal / ssh)

b90d4b9 Decon           Fix problems posting and loading images
a2500a7 Decon           Display title for images if available
a390c7b Decon           Select user name based on the following order: 1. If display name is same as username then show real name (if available). 2. Show display_name (if available) 3. Show real_name (if available) 4. Show username
8e4c2e1 Decon           Port deprecated API calls to Slack conversations API
a527ece root            Notification changes - merging by channel, sound on first only, added team to the title, auto remove when read in other client
c1d2312 Vlad G          Try to use sailfish webview for loging in. Works if you start harbour-sailslack from ssh.
468cde1 Vlad G          Slightly better urlChanged listener