Change script location.

Split js code.
Added cache and changed loading mechanism for js sources.

script/entities/vertex/model/VertexModel.js

@@ -0,0 +1,11 @@
+/**
+ * This is graph model used for hit test and draw.
+ *
+ */
+
+const defaultVertexDiameter = 30;
+
+function VertexModel()
+{
+    this.diameter = globalApplication.GetDefaultVertexSize();
+}