Just tried adding Cordova 6.0.0 after removing plugins that reference Wkwebview. App itself works well although now none of my external links to web sites will open. No errors in console, no other changes other than adding:
<preference name="scheme" value="app" />
<preference name="hostname" value="localhost" />
These are pretty standard web addresses, no ajax, etc.:
<a href="https://www.merckvetmanual.com" class="external item-link item-content" target="_system">Merck</a>
Any ideas?