message: mol-plugin: added customState to PluginContext
diff: @@ -131,6 +131,12 @@ export class PluginContext {
  substructureParent: new SubstructureParentHelper(this)
  } as const;
  + /**
  + * Used to store application specific custom state which is then available
  + * to State Actions and similar constructs via the PluginContext.
  + */
  + readonly customState: any = Object.create(null);
  +
  initViewer(canvas: HTMLCanvasElement, container: HTMLDivElement) {
  try {
  this.layout.setRoot(container);
  