Add smoth animation for new messages (Fade in effect for messages and scrolldown effect MessageDisplayWidget).
Merge branch 'origin/master'

Conflicts:
	projectfiles/QtCreator/TOX-Qt-GUI.pro
	src/messagedisplaywidget.cpp
	src/messagedisplaywidget.hpp
fix merge error
Fixed Message Display differentiating senders wrongly

Message Display was differentiating senders by their username, which is not
unique. When two clients had same name, messages were dislayed as if it was one
person writing.
Add animation settings option
and fix bug
Merge branch 'upstream/master'

Conflicts:
	src/messagedisplaywidget.cpp
	src/messagedisplaywidget.hpp
Merge pull request #45 from Schlumpf/animation

Smoth animation for new messages