Migrate to mtxclient for the http calls

CMakeLists.txt

deps/CMakeLists.txt

deps/cmake/Olm.cmake

deps/cmake/SpdLog.cmake

include/AvatarProvider.h

include/Cache.h

include/ChatPage.h

include/CommunitiesList.h

include/Logging.hpp

include/LoginPage.h

include/MainWindow.h

include/MatrixClient.h

include/RegisterPage.h

include/RoomList.h

include/TextInputWidget.h

include/dialogs/ReCaptcha.hpp

include/dialogs/RoomSettings.hpp

include/timeline/TimelineItem.h

include/timeline/TimelineView.h

include/timeline/TimelineViewManager.h