Add more cool patterns.

Ideas

• Matrix code cracking one DONE
• Sin wave sort of thing
• Printing out lines of code like Geektyper (provide option for custom source file?)

Add command line arguments for things like speed, cooldown for line starting, custom alphabet, etc.

Some glyphs don't get cleared from the screen (overwritten by space), which means they stay on the screen until another line is spawned in the same column. With the current implementation, this means that there will be a full column of the same character until another line overwrites it.

Make lines fade out more smoothly instead of abruptly transitioning to gray 3/4 of the way through.

Finish adding ANSI formatting to the helper file. Includes formatting like bold, strikethrough, etc., as well as all background colors.