v1.21: Added files for Build 20

The 1.2 update of the Scares Scrambler has been the longest update to make so far, mostly because of some huge behind-the-scenes code overhauls. Here's a list of new features that may interest you:
-Corrupt & Repeat: Generate multiple corrupted files at once!
-New Dubby Theme: Don't ask.
-New Folder Selector: For getting exact paths for the corrupted file.
-Two New Algorithms: Smoother and Blender; they're pretty fun.
-UI Update: Just some small quality-of-life improvements.
-Corruption Progress Bar: Blink and you'll miss it.
-Mixer Algorithm: You'll never know.
-Bugfixes: Because hey, why not?
-Probably Other Stuff I'm Forgetting

Hope you have fun with all the new stuff!