Show an MRTK3 service to read (and position) QR codes using HoloLens 2 Upgraded for latest version of MRTK3 GA.

Before opening issues:

• please pull this MRKT3 branch first
• Use the same Unity version I used (2021.3.23f1)
• Deploy in a HoloLens 2 using the Master / ARM64 configuration. Nothing else works

• Use Minimum target platform 10.0.18362.0

Maybe other versions work, these settings works for sure.

As far as I know:

• Deploying for anything else than Master / ARM64 either doesn't work at all, or is too slow to be useful
• It does not work in the editor, and it doesn't work with Holographic Remoting either.
• If you use different Unity or SDK versions, you are on your own.

It works. It really works. All of it.