Change script location.

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

script/features/draw_graph/api/index.js

@@ -0,0 +1,10 @@
+{
+let modulDir = "features/draw_graph/";
+
+doInclude ([
+    include ("model/BaseBackgroundDrawer.js", modulDir),
+    include ("model/BaseEdgeDrawer.js", modulDir),
+    include ("model/BaseVertexDrawer.js", modulDir)
+])
+
+}