Start implementing link dragging

js/input/DragLink.js

@@ -0,0 +1,24 @@
+import MouseClickDrag from "./MouseClickDrag"
+
+export default class DragLink extends MouseClickDrag {
+
+    constructor(target, blueprint, options) {
+        super(target, blueprint, options)
+    }
+
+    startDrag() {
+        //this.selectorElement.startSelecting(this.clickedPosition)
+    }
+
+    dragTo(location, movement) {
+        //this.selectorElement.doSelecting(location)
+    }
+
+    endDrag() {
+        if (this.started) {
+            //this.selectorElement.finishSelecting()
+        } else {
+            // this.blueprint.unselectAll()
+        }
+    }
+}