Added service builder pattern for 'listing' services.

I've therefore removed two mapper classes, and added a new method in another mapper.

It's a reduction of code. A reduction of code.
Moved delete thread mapper into builder.
Removed delete post / thread mappers from list posts.

Now using builders.
Refactored service mappers in list threads page.

Now we're using a servicebuilder through in the views which start the controllers.
Edit post / thread and add post now use service builders not mappers.

Fixed a bug where the pagination for the posts was the pagination for the threads.
Changed the list threads long press event object.

Now has the menu item in it directly.
Now the dialogue opener works with list view long presses too.

Ergo removing two more unneeded classes.