Detangle DCEL class from schematization methods

[jakoblistabarth]

Approach B

• move schematization related methods from Dcel components to Schematization
  • add c-schematization related properties in a separate map (with keys using uuids?)
  • add methods like schematization.classifier.isSignificant(vertex)

Approach A

• extend Dcel components (Vertex, Edge, Face) from base Dcel components

Minimal working example of extending the Dcel components: typescript.org playground