Scene grabbables support

[keianhzo]

This PR adds support for grabbale objects in Hubs. Now using the grabbale component (Hubs-Foundation/hubs-blender-exporter#282) Any scene object can be grabbable and capturable by a media frame.

Related Hubs-Foundation/blender-gltf-behavior-graph#16

[Exairnous]

I ran into this error when testing a scene with two grabbable cubes (one with the media frames collision mask, one without), a plane with a physics shape set to convex hull for the floor, and a media frame set to all objects; this was exported using the new PRs to the add-ons for this feature:

mediaLoaderObj is undefined
./src/bit-systems/media-loading.ts/mediaLoadingSystem/<@https://hubs.local:8080/assets/js/hub-86783bd68c802e0becf6.js:7122:5
mediaLoadingSystem@https://hubs.local:8080/assets/js/hub-86783bd68c802e0becf6.js:7113:32
mainTick@https://hubs.local:8080/assets/js/hub-86783bd68c802e0becf6.js:65147:82
./src/app.ts/setupRenderer/</</<@https://hubs.local:8080/assets/js/hub-86783bd68c802e0becf6.js:3732:74
onAnimationFrame@https://hubs.local:8080/assets/js/engine-f7f00df9e9582890925b.js:33685:59
onAnimationFrame@https://hubs.local:8080/assets/js/engine-f7f00df9e9582890925b.js:19340:16

[keianhzo]

I couldn't reproduce this on my end, maybe we can take a look at it at the Meetup.

I ran into this error when testing a scene with two grabbable cubes (one with the media frames collision mask, one without), a plane with a physics shape set to convex hull for the floor, and a media frame set to all objects; this was exported using the new PRs to the add-ons for this feature:

[Exairnous]

Sure, we can check it at the meetup.

[Exairnous]

Strange. I can't reproduce it now either.