Closes #1302. Thanks to Marcus Watkins.

Closes #1294. Thanks to Lucas Ramage.

Thanks to Karl Palsson.

Closes #1266.

Thanks to Erik Moqvist.

Closes #1274.

Thanks to jsaak.

Closes #1276.

Thanks to TimmvonderMehden.

Closes #1264.

Thanks to janniswarnat.

Closes #1285.

Thanks to Rob de Jonge.

Closes #1284.

Closes #1152. Thanks to Dustin Sallings.

Closes #1280. Thanks to Lucky Saini.

Clients now receive message from all matching subscriptions rather than
the first one encountered, which ensures the maximum QoS requirement is
met.

This was happening when clean start was set to true.

Closes #1294. Thanks to Lucas Ramage.

Client initiated renegotiation is considered to be a potential attack
vector against servers.

Closes #1257. Thanks to Daniele Sluijters.

Ssl fixes for ENGINE and UI includes

This occurs after they reconnect, having sent DISCONNECT
on a previous session.

Closes #1227. Thanks to usernametaken.

mosquitto_broker.h and mosquitto_plugin.h

Thanks to Wolfgang Petroschka.

Closes #1290.

Thanks to Karl Palsson.

Closes #1266.

Thanks to Erik Moqvist.

Closes #1274.

Thanks to jsaak.

Closes #1276.

Thanks to TimmvonderMehden.

Closes #1264.

* Fix Will message for a persistent client incorrectly being sent when the client reconnects after a clean disconnect.
* Fix Will message for a persistent client not being sent on disconnect.
* Fix mosquitto_pub not using the `-c` option.

Thanks to Yannic Schröder.

Closes #1273.

Thanks to janniswarnat.

Closes #1285.

Thanks to Rob de Jonge.

Closes #1284.

This was not being copied to the in-use listener when compiled without
TLS support.