Steam basic functionality added - Game Logic done

First version that allows to create matches through Steam. Joining matches pending to test.
No apk will be included until Steam functionality is complete.

Game Logic is finished. List of all characters included in the game:

Original game:
Suzy Lafayette, Paul Regret, Pedro Ramírez, Calamity Janet, El Gringo, Jourdannais, Lucky Duke, Slab the Killer, Willy the Kid, Jesse Jones, Bart Cassidy, Black Jack, Kit Carlson, Rose Doolan, Sid Ketchum, Vulture Sam.

Dodge City:
Doc Holiday, Tequila Joe, Belle Star, Greg Digger, Apache Kid, Chuck Wengam, Bill Noface, Elena Fuente, Herb Hunter, José Delgado, Molly Stark, Sean Mallory, Pat Brennan, Pixie Pete.

Wild West Show:
Big Spencer, Flint Westwood, Youl Grinner, Gary Looter, Teren Kill, John Pain, Lee Van Kliff.

The Valley of Shadows:
Colorado Bill, Evelyn Shebang, "Dobletiro", Black Flower, Henry Block, Tuco Franciskaner, Lemonade Jim.

Gold Rush:
Madam Yto, Don Bell.

Special Characters:
Johnny Kisch, Annie Versary.