Version check

xF2 Add-on Version check 2.0

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Removed dependency to use file_get_contents.
Added Note column. The Note column will indicate if the add-on requires XF v2.1 or newer.​
Added additional check to prevent server error logs.​
Added a new feature called "Upgrade option" which can be enabled in the Options page. This new feature allows easy upgrading of add-ons.​
Removed orphaned Options page.​