Ability to block all touches, including within the showcased view circle

There was no way to pass custom `ConfigOptions` from `ShowcaseViews` to `ShowcaseView`, so this commit changes the defaults. If there's a better way, please...

I don't like changing default behavior, but I do believe this is a better default due to the current behavior of the showcase when clicking inside the circle (it doesn't go away, and if you use `ShowcaseViews` it's even worst).