Redesign chat message and empty chat page message

* Use less rounded corners for chat message bubble
* Use border with little transparency instead of drop shadow for chat message bubble
* Use consistent text color for own messages and messages of chat partners
* Use background color as chat message bubble color for own messages
* Use light hover color as chat message bubble color for messages of chat partners
* Use chat message style for empty chat page message
10 jobs for new-design in 20 minutes and 5 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
failed #23001
allowed to fail
clazy

00:00:49

passed #23002
qmllint

00:00:34

 
  Build
passed #23006
archlinux

00:01:29

passed #23005
debian-sid

00:01:16

passed #23004
neon-bionic

00:01:47

passed #23003
ubuntu-trusty

00:01:21

 
  Deploy
passed #23009
allowed to fail
android

00:08:58

passed #23007
allowed to fail
linux-appimage

00:09:57

passed #23010
allowed to fail
mac-osxcross

00:05:59

passed #23008
allowed to fail
windows-mxe

00:05:01

 
Name Stage Failure
failed
clazy Test
  CMake will not be able to correctly generate this project.
Call Stack (most recent call first):
CMakeLists.txt:10 (project)


-- Configuring incomplete, errors occurred!
See also "/builds/melvo/kaidan/build/CMakeFiles/CMakeOutput.log".
See also "/builds/melvo/kaidan/build/CMakeFiles/CMakeError.log".
ERROR: Job failed: exit code 1