Voice messages - Sending a voice message

[gileluard]

MSC2516 is under review to add a new message type for voice messages. We will have to use org.matrix.msc2516.voice as the msgtype for now, but once it's in the spec properly then we can switch to m.voice.
What will probably end up happening is in code there will be a if (msgtype === "org.matrix.msc2516.voice" || msgtype === "m.voice") statement for several releases, once m.voice is allowed.

• While sending the voice message, the message is showing the audio bar and a progress
• Once sent, the sent tick is shown