ply parser generalization

src/mol-geo/geometry/mesh/builder/triangle.ts

src/mol-geo/geometry/mesh/mesh-builder.ts

src/mol-io/reader/_spec/ply.spec.ts

src/mol-io/reader/csv/data-model.ts

src/mol-io/reader/ply/parser.ts

src/mol-io/reader/ply/schema.ts

src/mol-model-formats/shape/ply.ts

src/mol-plugin/state/transforms/data.ts