[OJS.de - OA-S I - ap3: core OJS infrastructure] Defining the metrics API in the ReportPlugin base class
[OJS.de - OA-S I - ap4: event logging hook] Implement event logging hook.
[PKP bugs] Add request to template manager calls in issue handler.

Conflicts:

	pages/issue/IssueHandler.inc.php
[OJS.de - OA-S I - ap6: opt-out and privacy info] implement opt-out and privacy info.

Conflicts:

	pages/manager/PluginHandler.inc.php