Version 2.0.19 released.

Version 2.0.19 of Mosquitto has been released. This is a security and bugfix release.

Security: - Fix mismatched subscribe/unsubscribe with normal/shared topics. - Fix crash on bridge using remapped topic being sent a crafted packet. - Don't allow SUBACK with missing reason codes in client library.

Broker: - Fix assert failure when loading a persistence file that contains subscriptions with no client id. - Fix local bridges being incorrectly expired when persistent_client_expiration is in use. - Fix use of CLOCK_BOOTTIME for getting time. Closes #3089. - Fix mismatched subscribe/unsubscribe with normal/shared topics. - Fix crash on bridge using remapped topic being sent a crafted packet.

Client library: - Fix some error codes being converted to string as "unknown". Closes #2579. - Clear SSL error state to avoid spurious error reporting. Closes #3054. - Fix "payload format invalid" not being allowed as a PUBREC reason code. - Don't allow SUBACK with missing reason codes.

Build: - Thread support is re-enabled on Windows.