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/RemoteConsoleCommandSender.php

@@ -44,7 +44,7 @@ class RemoteConsoleCommandSender extends ConsoleCommandSender{
 		return $this->messages;
 	}
 
-	public function getName(){
+	public function getName() : string{
 		return "Rcon";
 	}