[cXF] Thread snippet 1.1.4

Description:
Show thread snippet (excerpt) or thread preview on forum view and what's new page with some extra features.

Features:

• show thread snippet in thread list on forum view
• show thread snippet on what's new page
• show thread snippet on New posts widget (simple view)
• show thread snippet on New threads widget (simple view)
• set snippet length for each position individually
• show first or last post in thread snippet
• remove BB codes from snippet
• style snippet in style properties
• set page width for snippet to show or hide (for instance to hide it on mobile)