Change date 3.4

Change date v3.4 changes:

Fixed issue with xf_thread.first_post_id update.

Change date v3.3 changes.

Compatible with XF 2.3. Added "Use current time" link.

Change date v3.2 changes:

Compatible with XF 2.2. Removed "Use current time" link.

Change date v3.1 changes:

Now compatible with XF 2.2 and 2.3.

Change date v3.0 changes:

Fixed issue with "does not match formatter pattern" server error was being displayed.

Change date v2.9 changes:

Compatible XF 2.x versions: 2.3

Change date v2.8 changes:

Latest activity is now updated.

Change date v2.7 changes:

Now updateds forum_view last post date column.

Change date v2.6 changes:

Now compatible with XF 2.0, XF 2.1 and XF 2.2.

Change date v2.5 changes:

Updated change date overlay to show date selector first.