They are already handles by another codepath

Summary:
Store PendingIntents from notification actions. Send list of notifications to desktop and trigger Intent when matching packet arrives.
CCBUG: 366475

Test Plan: Create test notification, trigger package is received correctly. Whether intent.send() is actually successful is NOT yet tested.

Reviewers: #kde_connect, sredman

Reviewed By: #kde_connect, sredman

Subscribers: sredman, apol, MatMaul, kdeconnect, mtijink, #kde_connect

Tags: #kde_connect

Differential Revision: https://phabricator.kde.org/D12294

Previously was bugged: If the SMS plugin was enabled but the Telephony was not, the SMS plugin would not have worked. Good thing nobody noticed! :)

Does this cause problems with older SDKs? I don't think so. (If there are problems, I assume they were already there)

Returning NULL from readSymbolicLink() results in an exception that
closes the SFTP connection for some SSH implementations, notably the one
used by Gvfs (GSConnect).

primitive-ftpd had a similar issue, which was fixed by returning and
empty string instead of NULL.

And changed pickFirst to merge, that concatenates the contents