Use C++11 braced list style (#121)

.clang-format

src/Cache.cc

src/EmojiPanel.cc

src/EmojiPickButton.cc

src/EmojiProvider.cc

src/ImageItem.cc

src/ImageOverlayDialog.cc

src/Login.cc

src/LoginPage.cc

src/MainWindow.cc

src/MatrixClient.cc

src/Register.cc

src/RoomInfoListItem.cc

src/SideBarActions.cc

src/TimelineItem.cc

src/TimelineView.cc

src/TimelineViewManager.cc

src/TopRoomBar.cc

src/TypingDisplay.cc

src/UserInfoWidget.cc