GUI: Rename some methods, start to implement new one

source/client/newui/screens/MainScreen.cpp

@@ -0,0 +1,17 @@
+/********************************************************************
+	Minecraft: Pocket Edition - Decompilation Project
+	Copyright (C) 2023 iProgramInCpp
+
+	The following code is licensed under the BSD 1 clause license.
+	SPDX-License-Identifier: BSD-1-Clause
+ ********************************************************************/
+
+#include "MainScreen.hpp"
+#include "../controls/Button.hpp"
+
+// TODO: Read splashes from splashes.json
+
+MainScreen::MainScreen() : Screen()
+{
+	m_controls.push_back(new Button(1, 1, 100, 24, "Hello, world!"));
+}