XF2 Addons [AndyB] Version check 2.0

Checks add-ons developed by XF2 Addons and reports if any need upgrading.

Version check v2.0 changes:

Ensure only xf2addon.com are shown.

Version check v1.9 changes:

Now uses XenForo temporary directory and file functions.

I've updated this resource to the latest version

1.8​