Automatically unzip loose .zip files present in Mods folder.

[AnotherPillow]

Automatically finds .zip files in the Mods folder root, and automatically unzips them into the Mods folder.

[Shockah]

I feel like this PR would create more problems than it would solve, as it's not backwards compatible. If a user had .zip files stored in their Mods folder for whatever reason (for example, mod backups), you'd suddenly start extracting these without prompting the user.

[Pathoschild]

Thanks!

I think there are some edge cases we'd need to think about though. For example:

• It's a zip that's not meant to be installed (like a backup, disabled mod, download that's already extracted, etc). I know I've intuitively disabled folders in both Stardew Valley and other games by zipping them.
• It's already installed (possibly with a different folder path).
• It has files directly in the root of the zip.
• It's not a valid mod.
• It's not a valid .zip.

It might also be confusing that .zip files are unpacked, but other formats like .rar and .7z aren't.

I prefer avoiding automatic behavior that might be unexpected or cause unexpected effects. I think there'd be less potential issues with logging a message which explains how to unzip them instead (if the player wants to).

So I'll close this, but I do appreciate the pull request!