Option to choose pre-defined URI schemes (like "androidapp://" and "https://")

@grb I thought about merging… Now, I think, Android URI selector (PS: I just changed the title, and now it’s Get the URIs for (Android) apps more easily (like choosing the respective app in the BW app, to get the URI)) may be asking more about getting the complete URI more easy from an app, so I decided to “change” this feature request into requesting “pre-defined URI schemes”…

… as this was also a part of your original request @dsl8b1d8, right?

Our other posts contain some tips to get the URIs on Android, so I think this can remain as it is.

PS: As choosing pre-defined URI schemes should be useful in all apps, I changed the tag to app:all.