v3.0-beta8

Eighth beta release. This is mainly a bugfix release and features some optimizations on battery usage (hopefully). Published also on Google Play beta channel (Google Play flavor) and F-Droid (basic flavor).
This should be the last "restricted" beta release, meaning that, starting from next release, betas will be promoted to main release channel if beta testing is succesful.

Fixes:

• #315: fix back button behaviour in some situations
• #316: shorter contact list update time
• #318: try to decrypt messages anyway in case of errors

Changes:

• #311: support for client state indication
• #320, #321, #326: battery usage optimizations

Some of the issues are not shown here. You can see all the issues closed with this release here.
Download apk files here:

• https://kontalk.raunz.name/files/Kontalk-3.0-beta8-googleplay.apk (Google Play flavor)
• https://kontalk.raunz.name/files/Kontalk-3.0-beta8-basic.apk (basic flavor)