Add the archive ID to messages when they are sent to users

This makes us compatible with mam 6.0

fix #3249

Remove two sneaky log_debug

Properly convert the data into a number of seconds by using duration_cast

Look for uuid/uuid.h instead of just uuid.h

Avoids a conflict between /usr/include/uuid.h and
/usr/local/include/uuid/uuid.h on freebsd

MAM results can be filtered by start and end dates

Respond to MAM requests on a channel JID

At the moment, result-set-management is not implemented, the whole history
(well, at most 1024 messages) is returned.

If the maxHistoryLength is negative, make it 0

Instead of doing a broken SQL request that returns weird lines

When joining a channel, send the most recent history found in the database

When saving the logs, the date must be in seconds, not nanoseconds

Add a global configure ad-hoc command, with max history length

Add get_first_non_empty and use it into Database to simplify a little bit

Save received and sent messages into the database

Properly catch and handle database errors

Do not use a singleton for the database.

fix #3203

Replace all include guards by #pragma once

It’s $CURRENT_YEAR

Style fix

Move all constructors at the top of classes

Add a ChannelOptions table in the DB

And a way to retrieve its values, defaulting on the ServerOptions for unset
values.

Remove a write to std::cout from Database’s constructor

Only compile database.cpp if configured with litesql

Introduce an optional Database module

Uses litesql