Lua: add externs for rawset/rawget

std/lua/Lua.hx

@@ -18,4 +18,6 @@ extern class Lua {
 	public static function type(v:Dynamic): String;
 	public static function print(v:Dynamic) : Void;
 	public static function select(n:Dynamic, rest:Rest<Dynamic>) : Dynamic;
+	public static function rawget<K,V>(t:Table<K,V>, k:K) : V;
+	public static function rawset<K,V>(t:Table<K,V>, k:K, v:V) : Void;
 }