Add initial support for rich replies to nheko

deps/CMakeLists.txt

src/ChatPage.cpp

src/ChatPage.h

src/TextInputWidget.cpp

src/TextInputWidget.h

src/timeline/TimelineItem.cpp

src/timeline/TimelineView.cpp

src/timeline/TimelineView.h

src/timeline/TimelineViewManager.cpp

src/timeline/TimelineViewManager.h