Add User to reply widgets

[sssoleileraaa]

Description

To support journalist badges, we need to add logic in the sync to add a user object (the sender) to the ReplyWidget when it's created. We also need to add the currently logged in user object to the ReplyBox so that when we can add it to the ReplyWidget created when the user clicks the send button (and the reply is in a pending state). It would also be useful to have a boolean in the ReplyWidget that indicates whether or not the reply was sent by the currently logged in user so that we can use the same color for that reply badge across the conversation and across all conversations when we implement the GUI.

This change should support offline mode where the currently logged in user can be none.
This change should be tested across all the different reply states: pending, failed, success.
This change should be tested with journalist name changes and deleted journalist accounts.

[sssoleileraaa]

Closing in favor of #76