[XB] Thread Attachment List 2.0.4

Added ability to delete attachments

Fix: optimize DB query to check if thread has attachments, use cached value if Thread Attachment Count add-on installed

Added grid display mode (can be disabled in options)
Added option to show pagination instead "more" button

2.0.2
XF 2.2 and 2.3 compatibility

2.0.1:

• Added separate permission to view attachment list
• Added button to view associated post
• Fixed broken attachment URL when clicking on attachment name

Fix: "view all attachments" button is displayed with 0 attachments in thread