Reply pending state

[sssoleileraaa]

Description

Should fix: #294

Show the reply as grayed out until SendReplyJob is processed successfully. Make sure replies are not lost. This requires altering the replies database table so that we can store know when a reply is queued to be sent.

See zeplin for grayed out text visual. The animation icon on the left-hand side of the reply widget is out of scope for this issue.

[sssoleileraaa]

Note: if the reply fails show the bar at the bottom as red, as seen here in the Zeplin Screen:

Resolves #365 when this is done.

[sssoleileraaa]

Update: The red bar was added here: #464