Merge branch 'master' of github.com:iNPUTmice/Conversations

* 'master' of github.com:iNPUTmice/Conversations:
  bump agp
  version bump to 2.10.6
  pulled translations from transifex
  do not merge failed decryptions
  version bump firebasse-messaging lib

bump agp

Move to gradle wrapper fdroid wants

Merge remote-tracking branch 'singpolyma/dtmf' into integration2

* singpolyma/dtmf: (145 commits)
  Detect a video call in a consistent way
  Use a boolean for this state
  Switch onClicks to use DataBinding
  Polyfill to allow use on Android 21
  RtpSessionActivity: Fix NPE from using incorrect view id
  Changed dialpad icon to something more recognizable.
  Cleaned up DTMF code and click handling.
  WIP - dialpad and dtmf sending
  flush stanzas in batches
  code clean up in TagWriter
  Fix #4249.
  Clarify build instructions.
  allow verification of own omemo keys via uri
  bump dependencies
  version bump to 2.10.3-beta
  fix precondition for timeout handling
  bump agp version
  pulled translations from transifex
  add Samsung S4 to hardware aec blacklist
  add additional logging to image compression
  ...

bump agp version

bump gradle version and agp

bump gradle version

bump version to 2.9.1-beta

bump gradle and targetSdk

update gradle plugin

update some dependencies

bumped gradle version

update gradle

updade libraries and build tools

initial work toward api 26+

* introduce notification channels
* always use foreground service on 26+

bumped gradle version

updated gradle + plugin and fixed xmpp-addr version

updated gradle version

update gradle version

version bump to 1.16.2 + changelog