[WIP] Room-Verification Messages

resources/qml/Reactions.qml

resources/qml/TimelineRow.qml

resources/qml/TimelineView.qml

resources/qml/UserProfile.qml

resources/qml/device-verification/DeviceVerification.qml

src/ChatPage.cpp

src/DeviceVerificationFlow.cpp

src/DeviceVerificationFlow.h

src/EventAccessors.cpp

src/timeline/EventStore.cpp

src/timeline/EventStore.h

src/timeline/TimelineModel.cpp

src/timeline/TimelineModel.h

src/ui/UserProfile.cpp

src/ui/UserProfile.h