Make batchTable and featureTable accessible from the scene

It is now implemented in B3DMLoader and gives access to the original
objects so that functions like getKeys() or getData() can be used.

src/three/B3DMLoader.js

@@ -23,6 +23,10 @@ export class B3DMLoader extends B3DMLoaderBase {
 
 				model.batchTable = b3dm.batchTable;
 				model.featureTable = b3dm.featureTable;
+
+				model.scene.batchTable = b3dm.batchTable;
+				model.scene.featureTable = b3dm.featureTable;
+
 				resolve( model );
 
 			}, reject );

src/three/TilesRenderer.js

@@ -478,12 +478,7 @@ export class TilesRenderer extends TilesRendererBase {
 			case 'b3dm':
 				promise = new B3DMLoader( manager )
 					.parse( buffer )
-					.then( res => {
-
-						res.scene.batchAttributes = res.batchTable.header;
-						return res.scene;
-
-					 } );
+					.then( res => res.scene );
 				break;
 
 			case 'pnts':