In-Game GUI - Version 0.9.9.5.3

- changed in-game gui, removed the quit button, replaced the main menu
button, re positioned the undo movement button
- cleaned up code
- removed the UndoButton class
- renamed the old MenuButton class to GameMenuButton
- removed the old GameMenuButton class
- added in UndoButton functionality to new GameMenuButton class.
- removed old textures