Unshorten

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Thanks to the Reddit community (/r/android) for the great response and feedback!

-Polished settings UI
-A toast is shown immediately to provide quick UI feedback, a followup toast then replaces the first after the URL has been unshortened
-Support for a few new URL shortener services: Reddit, Instagram, Sound Cloud, and Strava
-Added sample URLs for the newly supported URLs
-Fixed one networking bug related to weak or no network connectivity
-Adds a broken sample link for testing