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.

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

Forward IRC invites to XMPP

On a client error, do not QUIT, just make the resource leave all channels

This should fix #3205

Forward mediated invitations (XMPP to IRC only)

Add ping to the disco info of the gateay

Don’t use ! as the separator for nicknames, use % instead

It’s now easier to use. The distinction between a nick and a channel name is
based on the first character (by default it's '#' and '&'). The user doesn’t
have to worry about which separator to use anymore.

fix #3066

Log a warning when we receive an iq without a from

Properly set the “from” of the ping results to the correct full JID

Support multiple nick session, except for IQs

ref #2556

Forward everything to all concerned XMPP resources

Remove all usage of std::list

Add methods to know which resource is on which server or channel

Associate a bridge with a bare JID instead of a full JID

ref #2556

Include the Configure ad-hoc command on biboumi's JID  for fixed_irc_server

Because a jid like “freenode.example.org” is both the JID for the configured
IRC server, and biboumi’s JID.

fix #3175

Fix a clang-check warning

I think it was a UB

Do not fail to build when litesql is not used

fix #3151

Add an ad-hoc configure command on IRC channels

Include encodingIn and encodingOut options, unused at the moment

Also store a reference instead of a pointer, in AdhocCommandsHandler