Sven Co-op version of de_kobbl for CS 1.6

It would've been... amazing!
But yeah, I got no time to work on this, it ain't my priority right now. >w<
Either way though, it's newer than fun_kobbl since fun_kobbl basically switched its game from CS 1.6 to SC and that's how sc_kobbl was born.
Have fun exploring this thing. :3