XF2 Addons [AL] Core Package 2.0.0 PL1

Shared library files used by all AddonsLab add-ons

The update removes class extension hack that keeps XenForo version compatibility between 2.x versions and now the hack is in the add-on https://xenforo.com/community/resources/al-compatability-layer.9536/ which is required by appropriate add-ons that need this functionality.