Improve BlockFactory initialization performance

as expected, expanding data range unconditionally resulted in some performance issues ...

src/block/BaseBanner.php

@@ -55,6 +55,9 @@ abstract class BaseBanner extends Transparent{
 		parent::__construct($idInfo, $name, $breakInfo);
 	}
 
+
+	public function getRequiredStateDataBits() : int{ return 0; }
+
 	protected function decodeState(BlockDataReader $r) : void{
 		//TODO: we currently purposely don't read or write colour (it's stored on the tile)
 	}