scan external drives for app updates

[RemoPro]

I have an external drive where I store many Mac apps that I use on all my Macs. Now it would be great if I could scan the drive for app updates as now its boring to check all manually.

[mangerlahn]

Thanks for the report! This should be covered by #143, which I already implemented locally. Will be part of the next update :)

[mangerlahn]

Closed as duplicate of #143