افزونه 2 [OzzModz/Banxix] Bump Thread 2.1.2 Patch Level 3

Fix: avoid "Attempt to read property "last_post_id" on null" when rebuilding forum last post info

XF 2.3 compatibility

Changelog:

• Now depends on Standard Library by Xon (v1.8.0+)
• Refactor: standarize XF class extensions & declaration of schema properties
• Added missing filterbar sort phrase

Added: Ability to have the bump thread button above the first post and in the quick reply.