Implemented Article >> Multi page article options: Overview page title and Overview page navigation title

With XF 2.2 taking longer than anticipated, I am going to move some of the features I've implemented for AMS 2.2 into AMS 2.1.x (starting with AMS 2.1.13).

As per title, I've added the ability to set an "Overview page title" and "Overview page navigation title" for each article (for use when the article is a multi page article only).

There is a new "section" on the Add article and Edit article forums titled "Multi page article options".



This contains 2 new options that lets you set a Overview page title and Overview page navigation title. These are used to replace the TERM "Overview" where applicable when the article is a multi page article (basically lets you give Page 1 of a multi page article a TITLE instead of using the generic term "Overview".



Here is an example of what setting the Overview page title and Overview page nav title does