(Bug 58991) Enable listed SpecialPages for the SMW\ContentProcessor

Adds $smwgEnabledSpecialPage and can be used to pages like RunQuery etc.

## Default
$GLOBALS['smwgEnabledSpecialPage'] = array( 'Ask' );

## SMW + SF related settings
$GLOBALS['smwgEnabledSpecialPage'] = array( 'Ask', 'RunQuery' );