HoloToolkit-Unity for Unity 5.5.0f3+

Release Notes:

1. Includes new Extensible Input System.
2. Master Moved to Unity Engine 5.5.0f3.
3. Updated HoloLens Project Configuration Wizard.
4. Spatial Mapping Namespace updated and assets organized.
5. Shaders now support stereo instancing and near clip fading.
6. Will also provide a release version Unity package in the External\Unitypackages folder.

Breaking Changes:

1. No Longer compatible with Unity technical preview builds.
   • Please use latest engine release from Unity.
2. All Input Systems updated to new Extensible Input System.