Make sure we don’t exceed 512 bytes when grouping JOINs

Group simultaneous JOINs into a single command, to avoid flooding

We still split the JOINs with a key and the ones without

Apply all the clang-tidy performance-* fixes

Apply all the clang-tidy misc-* fixes

Apply all the clang-tidy modernize-* fixes

Remove two sneaky log_debug

Merge branch 'persistent_chans' into 'master'

Add a Persistent option on channels

Closes #3230

See merge request !6

Add a Persistent option on channels

fix #3230

Refactoring louloulibs and cmake

Use OBJECT libraries
Remove the louloulibs directory
Write FOUND variables in the cache

Revert "Don’t send the unavailable presence to all resources, in the virtual channel"

This reverts commit 38ff50f5d2ca356f659429ff57546bd2364a0fef.

Don’t send the unavailable presence to all resources, in the virtual channel

Pass the shared_ptr by reference, to avoid useless copies

Add missing <algorithm> include for last commit

Only try to join chans only once, even if we received multiple presences

ref #3228

Send a presence error from the room, when receiving command ERR_BADCHANNELKEY

fix #2886

Add a None type for the Iid class (when the iid is completely empty)

Move all the connect() logic from TCPSocketHandler into a subclass

This way, TCPSocketHandler only deal with the message sending/receiving, not
the connect() or anything else.  This will be used for implementing servers
(because when a client is accepted, we don’t need all the connect() and dns
resolution stuff).

Some cleanups

Handle IRC message 341 (invite confirmation)

Correctly handle the nick change inside the virtual channel