Last improvements before release — Tents and Trees Steam update #234479

Here is a last patch before the release next week, coming from feedback of recent beta tests. Added keyboard support for undo and redo. You can undo a move with "Ctrl+Z" and redo with either "Ctrl+Shift+Z" or "Ctrl+Y" Added support of "fullscreen window" (also known as "borderless fullscreen"). This mode is better than standard fullscreen if you are using multiple monitors, or multi-tasking a lot. Available from the settings menu. Switching from windowed to fullscreen can now be done using F11 (as well as Alt+Enter). These changes are available on both the full game and the demo.