Delete messages more thoroughly (and at all) (#2114)

- Make sure delete_expired_messages and housekeeping runs once a day
- delete more info about messages when putting them to trash (esp. also
delete txt_raw, from_id and to_id as we don't need those anymore, so
they are data that was unnecessarily kept)

fix #1926, fix #2090

Also:

* Nicer test_utils: add send_text() and print_chat()

* Adapt ephemeral messages for testing (make them accurate to the second)

* Add test for ephemeral messages

* Make pop_sent_msg() really pop the last sent message

src/message.rs

@@ -110,7 +110,7 @@ impl MsgId {
         context
             .sql
             .execute(
-                "UPDATE msgs SET chat_id=?, txt='', txt_raw='' WHERE id=?",
+                "UPDATE msgs SET chat_id=?, txt='', txt_raw='', from_id=0, to_id=0, param='' WHERE id=?",
                 paramsv![chat_id, self],
             )
             .await?;