[XFA] Who Read This Content 1.3.0

New feature:

• Add a new option "Display users only once in the block" for Who has viewed block

New feature

• Add Who Read This Thread Importer

• Add detail link on "Who is viewing" block

Fix

• Issue with block "Who is viewing"

• Fix bug with mode "Insert all dates": now all read dates are displayed

• XF2.3 Compatibility