Eclipse Mosquitto™ 2.0.1

Broker:

- Fix websockets connections on Windows blocking subsequent connections.

 Closes #1934.

- Fix DH group not being set for TLS connections, which meant ciphers using

 DHE couldn't be used. Closes #1925. Closes #1476.

- Fix websockets listeners not causing the main loop not to wake up.

 Closes #1936.



Client library:

- Fix DH group not being set for TLS connections, which meant ciphers using

 DHE couldn't be used. Closes #1925. Closes #1476.



Apps:

- Fix `mosquitto_passwd -U`



Build:

- Fix cjson include paths.

- Fix build using WITH_TLS=no when the openssl headers aren't available.

- Distribute cmake/ and snap/ directories in tar.