[feature] open folder in file browser

[electricbrass]

It would be useful to have the ability to open a file browser not as a selection dialog with a callback but just a regular file browser window.

I believe this could largely reuse existing file dialog code. One limitation though is that zenity does not have a way to do this.

An alternative would be to have it be a wrapper around SDL_OpenUrl that handles escaping the path and prepending file://.

[icculus]

I'm wondering if it makes more sense to add a function to escape URL strings and let the app handle the rest, since SDL_OpenURL already says "this will do whatever the OS decides to do."

[electricbrass]

That would work for my use case and be useful for other situations as well, so that sounds good to me

[icculus]

I'm kicking this into 3.6.0, since this is (probably?) easy to handle.