Page Sets; Allow duplicate named Page Objects which can cause issues

Page Objects in a Page Set should be named uniqly across the entire Page Set.

Giving multiple Page Objects the same name may at best cause confusion and at worst cause the Page Set Script to fail to compile (if the Page Object are different types).

A Warnings section is now included on the Pages page of the Page Sets form if multiple Page Objects with the same name exist in the Page Set.

When automatically naming Page Objects (E.g., clicking on the TextBox button in the Page Set Designer), the name will now account for Page Objects on different pages.