I assure you it was not because of a script here on SRL. I just looked through
Ultra Mapple-Willow Cutter and found nothing that would send off your name/pass. In that script your username and password are, from what I've read, entered into a form that pops up when you run the script. This is
only used to supply your name and pass to the P07 include to log you in, that's all. Nothing is sent out or recorded.
Further more there is an extension in Simba (security.sex) that checks specifically for things like that. It's recommended you should always have this enabled. Now, if you have suspicions of any other scripts here on Villavu do post 'em here and we'll check them out just to be sure. But the script you listed is indeed safe.
You were simply "hacked" from something/someone else. There's a number of possibilities like you used
any other bot (even only downloaded, never used), you've played on a private server, you've followed some fishy links on YouTube, you ever let someone else on to your account, or perhaps you have some RAT or something on your computer. In either case, Simba, SMART, the includes and the scripts are not to blame here.