Sometimes confirmation for raw messages are received before the record
is actually saved in the database.
In this case, the code will preserve the Sent status.
This commit expands the confirmation mechanism to allow private group
chat messages to be confirmed:
Changes:
- Added a separate table for message confirmations as group chat
messages have same messageID but multiple datasyncID
- Removed DataSyncID from raw message (I haven't removed the column name
as it can't be done in sqlite without copying over the table)
Patryk Osmaczko
Andrea Maria Piana