Structuring

Another bit or restructuring of templates.

I started in Post page moving all the options related to attachments (at least the ones I found) to a single index $context['attachments'] so that everything is there.
Then I also split (again) the Post page template to allow override the way attachments are presented/handled. This should help @siddhartha-gupta in replacing the upload system (hint: you can use the hook ```integrate_post_after``` you won't find it in the code, but it is provided but the Dispatcher, see https://github.com/emanuele45/Dialogo/commit/88787e09ae756c4661319d8a53bee323bae92fe6 based on the name of the controller invoked <= note to self: something to document!!)