[XFA] RM Download from list - XF2 2.1.0

Corrected bugs

• Download button queries run once per resource in lists (loaded together with the list now)

New features

• Dedicated option group for the add-on, no longer mixed into the Resource Manager options
• Option to show the current version number on the button
• Option to show or hide the button on the resources index
• Option to limit the button to selected categories (all by default)
• Compatible with RM Marketplace: the button only appears when the visitor is allowed to download (purchase or license required)

Compatibility with XF 2.3