add support forwarding many messages

Today not Riot and not RiotX can not forward many messages at once. When need forward some count messages to another room - this is hard. You need forward one message (user need select message by long tap, select forward, select room, where forward, tap by this room), and do this with next message, and then next message... And at this moment you can think: "May be do not forwarding this messages?" :-)

I think We need some UI which can help select many messages before forwarding it to another room by once.