refactor: deprecate RootRenderer / Renderer

Use `RendererV2` instead of `Renderer` now. `Renderer` can still be injected
and delegates to `RendererV2`.

Use `RendererFactoryV2` instead of `RootRenderer`. `RootRenderer` cannot be used
anymore.

BREAKING CHANGE:
- `RootRenderer` cannot be used any more, use `RendererFactoryV2` instead.
  Note: `Renderer` can still be injected/used, but is deprecated.

modules/@angular/platform-server/src/server_renderer.ts

@@ -25,7 +25,11 @@ export class ServerRootRenderer implements RootRenderer {
   constructor(
       @Inject(DOCUMENT) public document: any, public sharedStylesHost: SharedStylesHost,
       public animationDriver: AnimationDriver, @Inject(APP_ID) public appId: string,
-      private _zone: NgZone) {}
+      private _zone: NgZone) {
+    throw new Error(
+        'RootRenderer is no longer supported. Please use the `RendererFactoryV2` instead!');
+  }
+
   renderComponent(componentProto: RenderComponentType): Renderer {
     let renderer = this.registeredComponents.get(componentProto.id);
     if (!renderer) {