Introduce and use KArchiveDirectory::addEntryV2

Summary:
The original addEntry can delete the entry that is passed in, but we have no way to know
about it, so when that happens if we try to use the entry afterwards it will crash

This patch changes all the cases where addEntry was used and the entry passed to it is used later in the code

Test Plan: Broken file doesn't crash anymore

Reviewers: apol

Reviewed By: apol

Subscribers: kde-frameworks-devel

Tags: Frameworks

Differential Revision: https://phabricator.kde.org/D20493