Compatibility with OS X Lion

The Map Editor Tiled is a great application, I would like to congratulate the developers for this great work.
And I have a suggestion that I believe will do a little better this wonderful app. What would be more integration with OSx Lion, such as:
- Fullscreen mode, so that the tools are better distributed, allowing more space to work with maps;
- Use of Popovers and Overlay Scrollbars (giving a better look at the program);
- Resume, you can close the app and then open and so it can continue working on a map where you left off;
- If possible the application was available on the Mac App Store;
- And finally, add a slider to zoom in / zoom out on a map. On the toolbar, without having to click on a menu. Making it easier to edit.

Thank you very much and wish success to this wonderful work, thank you,
Wesley Bastos.

No files, tests, or entry points are mentioned. Start by separating the requested OS X Lion features—fullscreen, popovers, overlay scrollbars, resume, Mac App Store distribution, and toolbar zoom—then determine which can be scoped independently. Done would require explicit decisions and acceptance criteria for each selected feature.

Written by the indexing model from the issue text.