App availability checker + migration assistant for Android users

@_TheJasonC I think they could have done more with the Galaxy Store. Unfortunately, it’s become redundant and needless at this point. If you get an app through the Galaxy Store, you can’t use it on any non Galaxy device. So, nobody should get any app that can’t also be had on the Play Store if they ever plan on or think that they might end up switching to a different company. Most apps are available through both the Galaxy Store and Play Store now.