Update 'src/app/core/drawers/drawer.js'

Fixed error in "app/core/models/application/actions/action-manager.js!push(action)" during intersection creation due JSON.stringfy
Improved header (LInE information)

src/app/core/drawers/drawer.js

@@ -1,7 +1,14 @@
-// iGeom JS
-// LInE: "free software and private data"
-// http://www.matematica.br
-// http://www.usp.br/line
+/*
+ * iGeom by LInE
+ * Free software to student private data
+ *
+ * http://www.matematica.br/igeom
+ * http://www.usp.br/line
+ *
+ * ./app/core/drawers/drawer.js
+ *
+ * @version 2020/06/14: now using app/core/models/application/actions/action.js
+ */
 
 import { drawerManager as DrawerManager } from "./drawer-manager";
 import { app as App } from "../../app";
@@ -79,7 +86,7 @@ export class Drawer {
 
   addAction (action) {
     try { // To avoid 'TypeError: cyclic object value'
-      this.drawerManager.addAction(action);
+      this.drawerManager.addAction(action); // app/core/drawers/drawer-manager.js
     } catch (error) { console.log("drawer.js!addAction(action): Error '" + error + "'"); }
     }