v85 release: Reworked Alignment code, new MRUK dep.

v83 release + minor hotfix (SDKs 83.0.1)

v81 release: simplified Photon, bug fixes

v77 synchronized release. (no new features)

Release for updated SDK 76.0.1

Summary:
Packages versions
com.meta.xr.sdk.core: 76.0.1
com.meta.xr.sdk.interaction: 76.0.1
com.meta.xr.sdk.interaction.ovr: 76.0.1
com.meta.xr.sdk.platform: 76.0.0

Reviewed By: jinsongh2

Differential Revision: D74913839

fbshipit-source-id: aa761af1e47ac8ed59e00d2e909814778e2d0e59

Release for updated SDK 76.0.0

* Upgraded to Unity Editor 2022.3.15f1 (Core SDK's min supported version)
* Now depends on Unity's OpenXR Plugin package (replaces the Oculus Plugin)
* Reduced the size of Scenes/ColocationSessionGroups.unity by utilizing more prefabs.

C# changes:
* Platform SDK initialization now fails gracefully and informatively.
* Added usage for Core API overload: OVRSpatialAnchor.LoadUnboundSharedAnchorsAsync(groupUuid, allowedAnchorUuids, unboundAnchors) (in ColoDiscoMan.cs).
* Replaced PlayerPrefs with a proper, relatively lightweight serializer (LocallySaved.cs).  Locally saved anchor IDs are saved to per-build and per-scene json datastores.
* Improved "remembering" anchors.
* Improved anchor.Source.IsMine reliability.
* Refactored PhotonAnchorManager for more robust functionality as well as readability.
* (minor)  Revisited several classes for cleanliness/readability (MenuController, SampleExtensions, ...).
* (minor)  Pulled several common functionalities up to separate source files (SampleStatus, SampleColors, PhotonExtensions).
* (minor)  Generally reduced explicit public singleton access in favor of public static methods.
* (minor)  Reduced the code complexity of some implementation details.
* (minor)  Removed unused Photon binaries, demos, utility code.

fbshipit-source-id: 62c5fa314a67bbf4c338908154d6f0c610dc526a

Meta XR SDK release v74.0.2

Meta XR SDK release v71