This release primarily adds new ratified functionality describing the
loader interaction with runtimes and API layers. Corresponding
definitions are now in the official openxr_loader_negotiation.h
generated header, rather than the loader_interfaces.h header previously
shipped only with the OpenXR-SDK-Source repository. This change only
affects vendors of runtimes and API layers as well as contributors to
the OpenXR loader: applications do not directly use this API, the loader
uses it on their behalf. A number of other small fixes are also
included.

-   Registry
    -   Extension reservation: Update author ID and reserve extensions
        for Varjo. (internal MR 3083)
    -   Extension reservation: Reserve 10 extension ids each for
        ANDROIDX & ANDROIDSYS. (internal MR 3086)
    -   Khronos ratified addition: Specify the existing loader
        negotiation functions (without modification) in the XML, moving
        from loader_interfaces.h to a new generated header
        openxr_loader_negotiation.h. (internal MR 2807, internal issue
        1953)
    -   XR_KHR_android_thread_settings: Fix the description of
        XrAndroidThreadTypeKHR enum values - they were swapped relative
        to their implicit meaning from their name. (internal MR 3077)
    -   XR_MNDX_egl_enable: Update version to 2 to reflect function
        pointer type change released in 1.0.29. (OpenXR-Docs PR 159)
-   SDK
    -   Loader: Fix loader build on Universal Windows Platform:
        build-system-only change. (Included in SDK hotfix 1.0.32.1.)
        (internal MR 3071)
    -   Loader: Correctly destroy the LoaderInstance when loader is
        done. (internal MR 3041)
    -   Remove obsolete loader_interfaces.h header, migrating uses (in
        loader and layers) to use the newly specified and ratified
        openxr_loader_negotiation.h, and adjust scripts for the addition
        of the loader negotiation APIs. (internal MR 2807, internal
        issue 1953, internal MR 3122)
-   Misc
    -   Update/correct names.
    -   Ship a .mailmap file in the public repositories, maintained
        separately from the larger one used in the private monorepo, to
        correct names/emails and unify contributor identities.
    -   Update Khronos Group copyright dates.

GitOrigin-RevId: a561c5898b72f59965790790a28bbc3b7e9bcf13