Fix deprecated function call issues with Qt 5.13

CMakeLists.txt

deps/CMakeLists.txt

nheko-backtrace.dump

src/RoomInfoListItem.cpp

src/TypingDisplay.cpp

src/Utils.cpp

src/Utils.h

src/dialogs/ImageOverlay.cpp

src/main.cpp

src/notifications/ManagerLinux.cpp

src/timeline/TimelineItem.cpp

src/timeline/TimelineItem.h

src/timeline/widgets/AudioItem.cpp

src/timeline/widgets/FileItem.cpp

src/timeline/widgets/ImageItem.cpp

src/ui/DropShadow.h

src/ui/InfoMessage.cpp

src/ui/Painter.h