[OzzModz/Banxix] Bump Thread 2.1.2 Patch Level 1

Fix: do not bump the date of the first thread post if there is an invisible post after it to avoid moving the post during rebuilding and, consequently, changing the TS (can be enabled in options at your own risk)
Fix: rebuild forum latest post information on thread bump (can be disabled in options)

• Added bump button in thread list
• Added button in thread tools menu (can be enabled in options)
• Added ability to disallow bumping for specific threads (from moderator tools menu)