Custom Authorizer support and EventStream fixes

Adds custom authorizer support and a sample showing how to connect using a custom authorizer. Also adds event stream fixes.

What's Changed

• fix(eventstream): move ContinuationCallbackData into ClientContinuation to fix memory leak by @MikeDombo in #436
• fix(eventstream): move callback data shutdown into ClientContinuation destructor by @MikeDombo in #437
• Added custom authorizer sample by @TwistedTwigleg in #423

New Contributors

• @MikeDombo made their first contribution in #436

Full Changelog: v1.18.0...v1.18.1

Device Defender Custom Metrics Support

Adds support for Device Defender Custom Metrics and adds a new Device Defender sample! Also adds some fixes to the Shadow sample, documentation generation updates, and more.

What's Changed

• Added ClientToken to ShadowDeltaUpdated by @TwistedTwigleg in #417
• Autodocs by @graebm in #419
• Update Shadow sample to get value before input by @TwistedTwigleg in #420
• Device Defender custom metrics support by @TwistedTwigleg in #401
• Updated PreRequisites file by @TwistedTwigleg in #421
• Readme Install Instructions Update by @TwistedTwigleg in #426
• Added note on supported data requirements for Device Defender by @TwistedTwigleg in #429
• Fix segmentation fault in iot client init functions by @TwistedTwigleg in #430
• Minor sample adjustments by @TwistedTwigleg in #432

Full Changelog: v1.17.0...v1.18.0

Greengrass IPC API refactor

This release contains a compile-time breaking change.

• This release contains a refactor of the Greengrass IPC APIs. The factories returning the operation by value as well as the unique_ptr variants have been removed. All operation factories now return a shared_ptr to the operation. This refactor was necessary to correct multiple memory management issues with the previous API contract. Transitioning to the new APIs should be a simple type change in the caller.

Update PubSub sample

What's changed:

• Add the device advisor scripts to enable GitHub Actions to automatically run device advisor test
• Split the PubSub sample down into smaller, connection focused samples
• Updated docs

Support mutual TLS using a certificate from a Windows cert store

What's Changed

• Support mutual TLS using a certificate from a Windows cert store by @graebm in #408

Full Changelog: v1.15.6...v1.16.0

Security Fix - OpenSSL CVE-2022-0778

Security Fix

• Updates the aws-crt-cpp submodule to a version that is not vulnerable to OpenSSL CVE-2022-0778 - a bug in BN_mod_sqrt() can cause the function to enter an infinite loop

Shadow sample update

What's Changed

• IMPROVEMENT: Modification to Shadow sample to show how to pass null as valid input by @TwistedTwigleg in #379

Full Changelog: v1.15.4...v1.15.5

Secure tunneling deadlock fix

• Fixes a potential deadlock when the secure tunneling implementation sends a large payload

Fix memory leaks in connection

What's Changed

• Fix the memory leak in aws-c-io. Update submodule head to the new release. Resolved issue #215

Greengrass IPC Api update

• Adds a new set of Greengrass IPC APIs that return unique_ptr, allowing the operation's scope to be arbitrary and not tied to where the operation was created.