Eclipse Mosquitto™ 1.4.2

This is a service release. The fixes are as follows:

Broker:

• Fix bridge prefixes only working for the first outgoing message. Closes #464437.
• Fix incorrect bridge connection notifications on local broker.
• Fix persistent db writing on Windows. Closes #464779.
• ACLs are now checked before sending a will message.
• Fix possible crash when using bridges on Windows. Closes #465384.
• Fix parsing of auth_opt_ arguments with extra spaces/tabs.
• Broker will return CONNACK rc=5 when a username/password is not authorised. This was being incorrectly set as rc=4.
• Fix handling of payload lengths>4096 with websockets.

Client library:

• Inflight message count wasn't being decreased for outgoing messages using QoS 2, meaning that only up to 20 QoS 2 messages could be sent. This has been fixed. Closes #464436.
• Fix CMake dependencies for C++ wrapper building. Closes #463884.
• Fix possibility of select() being called with a socket that is >FD_SETSIZE. This is a fix for #464632 that will be followed up by removing the select() call in a future version.
• Fix calls to mosquitto_connect*_async() not completing.