use updatedAt for channelsorting

CustomModels/channelmodel.cpp

config.h

container/sortedvector.cpp

engine.pro

persistancelayer.cpp

persistancelayer.h

repos/channelrepository.cpp

repos/channelrepository.h

repos/entities/rocketchatchannel.cpp

repos/entities/rocketchatchannel.h

repos/entities/rocketchatmessage.h

rocketchatserver.cpp

services/rocketchatchannelservice.cpp

sql.qrc

sql/migrations/6.sql