Patch 1.1 - Outlines!

I sporadically decided to make some progress on this today, so here you go. I'll still update it every now and then because it's fun and it's also an excuse to keep learning new stuff. I'll also mark this as the "1.1" update because I feel like outlines are a big enough new feature to just be a bugfix update.

• Added support for outlines! You can toggle the outline on and off through the Settings menu, as well as change its color.
• Updated settings menu, looks a little neater now (I'm so bad with TKinter UI, I'll figure it out eventually)
• If you try to set any color to black (0, 0, 0), it will now be set to "(1, 1, 1)" instead, which is close enough. Black is taken as the color to make transparent by the window. You can still hard-set it to pure black if you want through the config file to make it invisible, but it's not recommended.