Add camera picture sharing/preview support

Task-Id: #287
11 jobs for multimedia-messages in 17 minutes and 59 seconds (queued for 20 minutes and 31 seconds)
Status Job ID Name Coverage
  Test
passed #13655
clazy

00:01:05

passed #13656
qmllint

00:00:17

 
  Build
passed #13660
archlinux

00:01:12

passed #13659
debian-sid

00:01:00

passed #13666
neon-bionic

00:00:59

passed #13657
ubuntu-trusty

00:00:59

failed #13658
neon-bionic

00:00:32

 
  Deploy
passed #13663
allowed to fail
android

00:07:22

passed #13661
allowed to fail
linux-appimage

00:06:44

passed #13664
allowed to fail
mac-osxcross

00:06:09

passed #13662
allowed to fail
windows-mxe

00:05:35