Safe communication feedback

[juanky201271]

Ref: #761 (comment)

TODO:

• When messages are sent really fast the order can be wrong, because the confirming date could be the same. We need another date for sending. (zingolib feature) @zancas
• When the user open the keyboard... do a scroll to help the user to see the last messages.
• For messaging is interesting to have a few notes created because if the wallet have only one note, the messenger only can send one message at a time. (zingolib feature) @zancas
• Add a floating icon to chats for adding a new chat.