Export thread 1.7

Export thread v1.7 changes:

Now prevents soft deleted posts from being exported.

Export thread v1.6 changes:

Fixed issue with quoted posts. Now supports XenForo Media Gallery embeds.

Export thread v1.5 changes:

Now creates a HTML file.

Export thread v1.4 changes:

Added Export thread select page so that a Page and Per page can be set.

Export thread v1.3 changes:

Now shows all attached images as full size.

Export thread v1.2 changes:
Fixed issue with Limit phrase. Removed no longer needed template and phrase.

Export thread v1.1 changes:

Updated template modification to make it more compatible with third party styles.