Show presence and set custom status messages

resources/qml/Avatar.qml

resources/qml/TimelineView.qml

src/Cache.cpp

src/Cache.h

src/Cache_p.h

src/ChatPage.cpp

src/ChatPage.h

src/UserInfoWidget.cpp

src/UserInfoWidget.h

src/timeline/TimelineViewManager.cpp

src/timeline/TimelineViewManager.h