add parameter "--user-scripts" for custom user scripts

Marius Gripsgardrequested to merge
xenial_-_userscripts into main

Created by: balcy

custom user scripts for webapps relied on the "Ubuntu.UnityWebApps" module which was removed in https://github.com/ubports/morph-browser/commit/18d38c8ecb050f1e2313e46e153da413cf4545be#diff-0f082207c5919dab491e1030b99f9d8104f6f39d20ecf791924303a33b3bc31e

To enable them again, they can now be added with a new parameter "--user-scripts=...", e.g. "--user-scripts=scripts/script1.js,scripts/script2.js" for two user scripts in a subfolder "scripts"

Edited by Flo Lee

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