Merge branch 'cleanup' into 'master'

CustomModels/channelmodel.cpp

CustomModels/channelmodel.h

CustomModels/emojismodel.cpp

CustomModels/messagemodel.cpp

CustomModels/messagesearchresultsmodel.cpp

CustomModels/messagesearchresultsmodel.h

CustomModels/models.cpp

CustomModels/roomsearchresultsmodel.cpp

CustomModels/roomsearchresultsmodel.h

CustomModels/usermodel.h

android/androidcheckpermissions.cpp

android/androidfiledialog.cpp

android/androidfiledialog.h

api/meteorddp.cpp

api/meteorddp.h

api/restapi.cpp

container/modelobserver.cpp

container/modelobserver.h

ddpRequests/ddploginrequest.h

ddpRequests/ddpmethodrequest.h