Convert to SPDX copyright indicator

src/contents/ui/Bubble.qml

src/contents/ui/EventView.qml

src/contents/ui/LoginPage.qml

src/contents/ui/MainPage.qml

src/contents/ui/RoomListView.qml

src/contents/ui/RoomPage.qml

src/contents/ui/RoomTimelineView.qml

src/contents/ui/SendMessageBox.qml

src/contents/ui/Tab.qml

src/contents/ui/TabView.qml

src/contents/ui/event-types/Audio.qml

src/contents/ui/event-types/Emote.qml

src/contents/ui/event-types/File.qml

src/contents/ui/event-types/Image.qml

src/contents/ui/event-types/Notice.qml

src/contents/ui/event-types/Simple.qml

src/contents/ui/event-types/State.qml

src/contents/ui/event-types/Text.qml

src/contents/ui/event-types/TextTemplate.qml

src/contents/ui/event-types/Video.qml