Icon markers in images + 3D

[amacneil]

Would be awesome to support rendering "icon" markers (image + 3d), like webviz demo mode supports. We could either ship with some standard icons, or let you reference a URL or something.

Originally posted by @amacneil in https://github.com/foxglove/message-schemas/issues/24#issuecomment-1125260438

[jtbandes]

FWIW here are the icons bundled with webviz:

https://github.com/cruise-automation/webviz/blob/d82468c05fb2d3aeca670ff37999faeafa4d7ffc/packages/webviz-core/src/panels/ThreeDimensionalViz/constants.js#L41-L75

This feature isn't related to demo mode in webviz.

[jhurliman]

Referencing a URL would be a great start. We could provide some data: URL examples of base64-encoded SVGs.

Implementing this in the New3D panel should be straightforward, there is code to render arbitrary canvases to sprites.