replace to.id and from.id with toId and fromId

lib/network/modules/PhysicsEngine.js

@@ -524,18 +524,6 @@ class PhysicsEngine {
         edgeType: {},
         toId: edge.toId,
         fromId: edge.fromId,
-        // TODO when will toId not match to.id given that connected is true
-        // can we rewrite SpringSolver to only use toId and not to.id
-        // and remove these parameters
-        to: {
-          // if assumption above is not valid TODO update to.id and from.id when updating connected
-          // id: edge.to.id
-          id: edge.toId
-        },
-        from: {
-          // id: edge.from.id
-          id: edge.fromId
-        },
         options: {
           length: edge.length
         }

lib/network/modules/components/physics/SpringSolver.js

@@ -29,9 +29,9 @@ class SpringSolver {
         if (this.body.nodes[edge.toId] !== undefined && this.body.nodes[edge.fromId] !== undefined) {
           if (edge.edgeType.via !== undefined) {
             edgeLength = edge.options.length === undefined ? this.options.springLength : edge.options.length;
-            node1 = nodes[edge.to.id];
+            node1 = nodes[edge.toId];
             node2 = nodes[edge.edgeType.via.id];
-            node3 = nodes[edge.from.id];
+            node3 = nodes[edge.fromId];
 
             this._calculateSpringForce(node1, node2, 0.5 * edgeLength);
             this._calculateSpringForce(node2, node3, 0.5 * edgeLength);
@@ -40,7 +40,7 @@ class SpringSolver {
             // the * 1.5 is here so the edge looks as large as a smooth edge. It does not initially because the smooth edges use
             // the support nodes which exert a repulsive force on the to and from nodes, making the edge appear larger.
             edgeLength = edge.options.length === undefined ? this.options.springLength * 1.5: edge.options.length;
-            this._calculateSpringForce(nodes[edge.from.id], nodes[edge.to.id], edgeLength);
+            this._calculateSpringForce(nodes[edge.fromId], nodes[edge.toId], edgeLength);
           }
         }
       }