Red Balloon of Happiness

The new download runs on Windows and now also on Linux. It has 3 folders:
- Common: contains graphics, music... Don't delete this folder!
- Linux: contains Linux binary and its dependencies. Windows users can delete this folder.
- Windows: contains Windows binary and its dependencies. Linux users can delete this folder.

I chose to gather everything in a single archive to keep the files well organized, reduce upload time, minimize RMN disk usage and, above all, avoid player confusion about which download version is the most recent.