Block: Clean up internal constructor inconsistencies

I don't dare look how big this commit is or how many bugs it introduced...

src/pocketmine/block/ActivatorRail.php

@@ -25,11 +25,5 @@ namespace pocketmine\block;
 
 class ActivatorRail extends RedstoneRail{
 
-	protected $id = self::ACTIVATOR_RAIL;
-
-	public function getName() : string{
-		return "Activator Rail";
-	}
-
 	//TODO
 }