Support custom-rule challenge using /challenge
Support custom-rule challenge using /challenge

Challenges with custom rules previously required bypassing the
console commands. Now you can just do them with:

    /challenge USERNAME, gen8randombattle@@@teampreview

Zarel/Pokemon-Showdown-Client,Zarel/Pokemon-Showdown-Client,Zarel/Pokemon-Showdown-Client,Zarel/Pokemon-Showdown-Client