Adding of _t to (u)int types, and WChar to char32_t

See: eaae0bb5e

src/fios_gui.cpp

@@ -760,7 +760,7 @@ public:
 		}
 	}
 
-	EventState OnKeyPress(WChar key, uint16 keycode) override
+	EventState OnKeyPress(char32_t key, uint16_t keycode) override
 	{
 		if (keycode == WKC_ESC) {
 			this->Close();