Add AR functionality

[PixelPartner]

• AR Quicklook (.usdz) for non-interactive scenes
• AR Quicklook (.reality) for interactive scenes (with message listener?)
• model-viewer
• htmlPage with mode-viewer
• show QRCodes for usdz/reality/htmlPage with button on Desktop browsers

[PixelPartner]

My suggested way to add AR to liaScript is to place a json multi-line code block with all needed details near a markdown link of type image or video and internally merge both for overlayed UI and the features described above.

Like so:

![AR enhanced image link](https://example.com/3dmodels/previewimage.jpg) <!-- width=80% -->
{ "usdz": "https://example.com/3dmodels/noninteractive.usdz"
, "reality": "https://example.com/3dmodels/interactive.reality"
, "model-viewer": "https://example.com/3dmodels/noninteractive.glb"
, "html": "https://example.com/3dmodels/noninteractive.html"
}