Look into supporting multiple surfaces

[Acissathar]

Currently this tool treats all surfaces as one single surface. I haven't dived in to see if / what is needed to support multiple surfaces as my own use cases have not necessitated it.

However, one day I would like to look into it since multiple surfaces is a supported Unity workflow.

[Acissathar]

Not yet needed in a current project, but may in the future. Leaving note for future me:

CalculateTriangulation is supposed to return all active Surfaces, so in theory could just grab all surfaces in the scene, activate one at a time, create a mesh for said surface, then rebake, and then move onto the next surface.