Operational Pipelines, operations for model repair, flattening, io, optimal orientation, more

[BradenM]

• feat(utils): extend SerializableMesh eigen supported attrs
• feat(cli): update shell cmd setup
• fix(scad): update serializable mesh to o3d ref
• fix(scad): prevent infinite recursions due to recursive contexts included in reprs
• fix(build): maybe dont rebuild each joint twice for no reason
• feat(ops): add FlatOperation for aligning a given mesh's z-axis with origin
• feat(ops): add operation for repairing mesh non-manifold edges/vertices and other
• feat(ops): add optimal-orient operation for applying an optimally computed rotation matrix to mesh
• fix(ops): update flat operation to follow op protocol
• feat(ops): add mesh io operations
• fix(ops): bad arguments in repair ops
• fix(ops): bad args in orient op, add todo to figure out o3d ascii write
• feat(ops): add Operation protocol, OperationPipeline and OrientMesh/File pipelines
• feat(scad): execute orient mesh file pipeline post render