wolfMQTT v1.18.0 (22DEC2023)

v1.18.0 (12/22/2023)

Release 1.18.0 has been developed according to wolfSSL's development and QA process (see link below) and successfully passed the quality criteria.
https://www.wolfssl.com/about/wolfssl-software-development-process-quality-assurance

• Add curl easy socket backend. by @philljj in #380
• WOLFMQTT_EXAMPLE_CERT allowing static or extern cert assignment by @gojimmypi in #354
• Tiny readme cleanup. by @philljj in #381
• Fix high coverity issues by @embhorn in #379
• Add broker check to scripts by @embhorn in #385
• Cmake build fixes by @embhorn in #384