Changes

• Automatically follow execution when paused. So whenever you step forward, or step over, the code view will adjust to where the code execution has moved.
• Rework window resizing event handling again, this should fix grey screen issues.
• Avoid/minimise window flashes of white rectangles at startup before the game is ready to render.
• Windows: Toggle fullscreen/windowed without restarting the game.
• Update dependencies & compile with rust 1.43.