Merge branch 'plain-text-messages' into 0.7.0-dev

CMakeLists.txt

README.md

resources/langs/nheko_de.ts

resources/langs/nheko_el.ts

resources/langs/nheko_en.ts

resources/langs/nheko_fi.ts

resources/langs/nheko_fr.ts

resources/langs/nheko_nl.ts

resources/langs/nheko_pl.ts

resources/langs/nheko_ru.ts

resources/langs/nheko_zh_CN.ts

src/ChatPage.cpp

src/TextInputWidget.cpp

src/TextInputWidget.h

src/UserSettingsPage.cpp

src/UserSettingsPage.h

src/Utils.cpp

src/install-debian.txt

src/timeline/TimelineModel.cpp

src/timeline/TimelineViewManager.cpp