memory optimization: defer wasm load, reduce point/poly default fields

src/geo/point.js

@@ -42,13 +42,13 @@
             this.key = key || [x, y, z].toString();
         }
         this.poly = null; // parent polygon
-        this.dist = 0.0; // for group intersection sorting and tests
-        this.p1 = null; // used in sliceIntersect(), connectLines() and intersect()
-        this.p2 = null; // used in sliceIntersect(), connectLines() and intersect()
+        // this.dist = 0.0; // for group intersection sorting and tests
+        // this.p1 = null; // used in sliceIntersect(), connectLines() and intersect()
+        // this.p2 = null; // used in sliceIntersect(), connectLines() and intersect()
         this.pos = 0; // position in group
-        this.mod = 0; // group length (for modulus of pos)
-        this.del = false; // for culling
-        this.group = null; // for grouping in slice intersect, offset lines in trace
+        // this.mod = 0; // group length (for modulus of pos)
+        // this.del = false; // for culling
+        // this.group = null; // for grouping in slice intersect, offset lines in trace
     }
 
     /** ******************************************************************

src/geo/polygon.js

@@ -43,12 +43,12 @@
         this.area2 = 0.0; // computed as 2x area (sign = direction)
         this.perim = 0.0; // for caching the result
         this.bounds = new Bounds();
-        this.inner = null; // array of enclosed polygons (if any)
+        // this.inner = null; // array of enclosed polygons (if any)
         this.parent = null; // enclosing parent polygon
         this.depth = 0; // depth nested from top parent (density for support fill)
         this.delete = false; // for culling during tracing
-        this.fillang = null; // hinted fill angle
-        this.fill = null; // fill lines (only used by supports currently)
+        // this.fillang = null; // hinted fill angle
+        // this.fill = null; // fill lines (only used by supports currently)
         if (points) this.addPoints(points);
     }