Resolves #3281. Added documentation on speech permissions for Cordova apps on Android, by @corinagum, in PR #3508
Resolves #3316. Refactored platform-neutral APIs into the new api package, to be reused on React Native component, in PR #3543 by @compulim
- The new layering is core -> api -> component (HTML-only) -> bundle
- Includes composition mode, platform-neutral React hooks, and localization resources
- Most hooks are available in the new api package. Some hooks are only available on the existing component package, due to their platform dependency or coupling with visual components. For example, Web Worker, 2D canvas, useMicrophoneButton* are not available on the api package
- Most implementations of middleware are only available in component package due to their coupling with visual components or platform features. Some implementations, (e.g. card action middleware and activity grouping middleware) are available on api package. For example:
  - Carousel layout and stacked layout is only available on component package due to their coupling with their respective visual components
  - For card action middleware, imBack, messageBack and postBack actions are available on api package, but call, openUrl and other platform-dependent actions are only available on component package
- activityMiddleware, attachmentMiddleware, etc, now support arrays for multiple middleware
Resolves #3535. Add Technical Support Guide for guidance on troubleshooting information and navigating the Web Chat repository, by @corinagum, in PR #3645

Fixed

Fixes #3489. [Accessibility]: Fix AT saying 'Bot undefined said', by @corinagum in PR #3524
Fixes #3547. [Accessibility]: Add attachment middleware for screen reader, by @compulim in PR #3548
Fixes #3371. [Accessibility]: Add alt property for image in HeroCards, by @corinagum in PR #3541
Fixes #3310. Add quantity, tap and text field to ReceiptCards, by @corinagum in PR #3541
Fixes #3514. Fix PoliCheck language errors, by @corinagum in PR #3545
Fixes #3537. [Accessibility]: Ensure aria-roledescription is only used on elements with implicit/explicit role based off of WAI ARIA role attributes, by @corinagum in PR #3551, #3583, and #3587
Fixes #3431. Activities should not be delayed due to missing activity of type "typing", by @compulim in PR #3554
Fixes #3574. Creates workaround for Cognitive Services Speech SDK 1.13.1 regarding removed support of macOS/iOS, by @compulim in PR #3576
Fixes #3570. Adaptive Card speak property should be narrated by screen reader, by @compulim in PR #3573 and PR #3584
Fixes #3571. Error box should be hidden for Adaptive Card renderer when running in production mode, by @compulim in PR #3573