`MoveCursor` should affect `CursorPosition` immediately

The following code behaves incorrectly in N#:
```
MoveCursor(100, 100);
Wait(100);
MoveCursor(200, 200);
CursorPosition($x, $y); // returns (100, 100) in N# and (200, 200) in N2
```

`MoveCursor` changes cursor position by calling `_ctx.Window.SetMousePosition`, but `CursorPosition` reads `_ctx.InputContext.MousePosition`, which is only updated once per frame.