Typehinted up entity API

Did you guys think ALPHA7 changes were done?!
Sone stuff still needs some work, most notably data-properties can't be typed yet because they are just mushed into a couple of methods.

src/pocketmine/command/ConsoleCommandSender.php

@@ -124,7 +124,7 @@ class ConsoleCommandSender implements CommandSender{
 	/**
 	 * @return string
 	 */
-	public function getName(){
+	public function getName() : string{
 		return "CONSOLE";
 	}