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- Moved FAccessibleEventArgs out of FGenericAccessibleMessageHandler to avoid the need to include GenericAccessibleInterfaces.h in header files where all they really need is a forward declaration of the struct. - Removed instances of FGenericAccessibleMessageHandler::FAccessibleEventArgs to FAccessibleEventArgs. - Updated API for IAccessibleWidget and IAccessibleWindow that deal with getting and setting focus to also take a user index parameter. This facilitates multiple accessible users for the same application. -Updated platform files that leverage the old IAccessibleWidget and IAccessibleWindow focus API - Introduced FGenericAccessibleUser and FGenericAccessibleUserRegistry to GenericAccessibleInterfaces.h. An FGenericAccessibleUser is meant to be analogous to FSlateUser that keeps track of hardware users' focus. An FGenericAccessibleUserRegistry is a registry of FGenericAccessibleUsers. These interfaces are meant to insulate FGenericAccessibleMessageHandler from storing and tracking focus etc when that should be an implementation detail by other modules. - Refactored how FSlateCoreAccessibleWidgets set focus in the application. Accessible focus is now unified to a single code path that starts from FSlateAccessibleMessageHandler. Requests to shift accessible focus should be done by raising a Slate accessible event or through IAccessibleWidget::SetUserFocus() - Introduced finer grain querying of focus capabilities for an IAccessibleWidget. Users can now check if an AccessibleWidget supports regular focus (keyboard/gamepad), if it supports accessible focus and if the widget can currently accept regular or accessible focus. -Updated platforms to use the new FGenericAccessibleUser and FGenericAccessibleUserRegistry ApI to update and retrieve user focus. #preflight: 61af2481813adc3fbb2ca7d5 [CL 18396441 by Leon Huang in ue5-main branch]