Add triangles with pseudonormals and faces.

[rmrsk]

• Todo: Update ALL examples to use the triangle mesh clas
• Implement getClosestFaces for the triangle mesh class
• Triangles don't produce the correct result. Could be an inside/outside error
• TriMesh and Triangle should have a flipping functionality. This is in DCEL but not in the triangle mesh. Solved by letting TriMeshSDF take the DCEL mesh as input and then convert to triangles.
• Fix Intel CI errors
• Run all examples and ensure that they make sense
• After all the above is done, Update documentation to make it clear that we can also use direct triangle meshes, which will avoid some DCEL loop iterations. Must go through all literalincludes to ensure that they make sense.