Move tracking prefab to package, add export assetbundle capabilities for "arobject" , packages now target version with mesh tracking

Merge branch 'develop' of ssh://labs.etsi.org:29419/arf/world-analysis-api-helpers/unity-world-analysis-validation into develop

Change app icon.
3D assets now appear when they are tracked.

Exemple scene for websocket and pose update.

HHI scene for the valid use-case.
Adaptation of some scripts.

Integration of NSwag interface in the package.

See merge request !1

Move tracking prefab to package, add export assetbundle capabilities for...

See merge request !2