Show status of media message transmission

[michaelkirk]

There is no indication of a media message being sent until it's succeeded.

Problems with this are:

1. While a message is being sent, I have no indication of progress (or even that I'm trying to send a picture, vs. maybe I accidentally bumped the cancel button in the image picker)
2. I will never know if a message fails to send vs just hasn't succeeded yet.
3. No way to "retry" sending media messages as you can with text messages.

Compare this to the (much better) handling of transmitting simple-text through signal-iOS. Upon sending, a bubble immediately appears, and then updates it's display to indicate that sending was successful. Also, the user is shown when the transmission fails, and given an opportunity to resend. With a media message, if sending fails, there is no way to "retry" transmission. Instead, you'd have to go through the attachment process again.