Optimize Knitted3D ++ (stitch).
Reformat (no code changes).
Remove unused imports.
Cache plans in planner.
Rename PlannerM.run to PlannerM.buildPlan.
Simplify Plan, run no longer accepts a KnittingState.
Finish reworking of Plan.
Rewrite optimizers to take advantage of the new Plans (faster now).
Change planner to the new Optimizers.