Enable -Wconversion

CMakeLists.txt

src/AliasEditModel.cpp

src/Cache.cpp

src/CacheCryptoStructs.h

src/CacheStructs.h

src/ChatPage.cpp

src/JdenticonProvider.cpp

src/MxcImageProvider.cpp

src/ReadReceiptsModel.cpp

src/Utils.cpp

src/dbus/NhekoDBusApi.cpp

src/encryption/Olm.cpp

src/main.cpp

src/timeline/CommunitiesModel.cpp

src/timeline/Permissions.cpp

src/timeline/TimelineModel.cpp

src/timeline/TimelineModel.h

src/ui/MxcAnimatedImage.cpp

src/ui/MxcMediaProxy.cpp

src/ui/RoomSettings.cpp