update: make icon extraction less dependent on aapt
For androguard, @TheZ3ro already developed a way to get all the icons after only extracting the icon name. So this uses that for the aapt-based scans also, to make them less brittle.
This should fix the problem where fdroid update
was choosing the XML icon for apps that include one, like NewPipe.
closes fdroid-website#192 (moved)
Edited by Hans-Christoph Steiner