Introduce TraceWidthSolver to select higher trace widths if they are available for AssignableAutoroutingPipeline2 (#459)

* wip

* wip

* init trace width solver

* draw trace width when given

* more separation for keepout solver

* wip

* wip

* wip

* variable step distance

* add 0.3 to correct small issues

* remove smoothing

* only accept better clearances

* remove self intersections

* snapshot updates

Author: seveibar

examples/bug-reports/bugreport29-7deae8/bugreport29-7deae8.json

@@ -4108,7 +4108,9 @@
         ]
       }
     ],
-    "minTraceWidth": 0.15
+    "minTraceWidth": 0.15,
+    "defaultObstacleMargin": 0.1,
+    "nominalTraceWidth": 0.25
   },
   "circuit_json": null,
   "subcircuit_id": null,