[REQ] Option to view full timestamp instead of "timeago"

[kamzil]

First of all, thanks for the amazing app!

Describe the problem that needs solving

Currently, I can only see e.g. "a day ago" next to the message. However, often more precise time is useful.

Describe the solution you'd like

I'd like to be able to see the exact timestamp of a tweet at least with minute precision, either for all tweets by changing a global setting, or e.g. by long-pressing the timestamp.