Integrate new TraitInfo/SketchInfo model code with existing Trait/Sketch.

[DylanLukes]

• [x] #89

• [x] #90

• [x] #93

• [x] #91

• [x] #92

• [ ] Pass tests in #103.

[DylanLukes]

All that remains is #103 tests passing.

[DylanLukes]

Subsumed/broken down by #105, #111, #112, etc