MDL-20204 first batch of major theme changes, some regressions are still there, expect more changes and improvements soon; see tracker for details and list of subtasks

The following are notable changes made in this commit
* Lesson page type are now class based and extend an abstract class. This includes a class for the page type and a class for the creating/editing a instance of this page.
* Converted all forms to mforms
* Action script located in mod/action/* were worked into the above so far less switch statements and the action directory will be removed.
* Implements a custom renderer
* Converted everything to use page, output, and custom renderer methods
* Replaced all deprecated methods incl. print_textarea conversions
* Tried to cut down on excessive DB calls.
Things worth noting:
* The focus of this patch was on cleaning up the module not rewriting it, as such I have organized NOT rewritten. There are still many areas in the module where the code could be greatly improved however to do so would require a rethink/rewrite

fixed a few more that were pointing to lib.php rather than locallib.php

This means for places in Moodle that are going to write a file, like a
CSV file, they can set the intended mimetype of the generated file.

Previously you had to use a stored_file object.

This also gets rid of portfolio_fake_add_url function and replaces the
data module implementation with a button.  I also refactored
portfolio_add_button::to_html to use moodle_url so it's easy to return
the same parameters to hidden form fields, an escaped url (for a link),
and a non escaped url (to redirect to, which is what the data module
does)

"MDL-21103, fixed regex filter in tinymce plugin, and overwriten uploaded file with the same filename by default"

navigation MDL-20735 Activities added to the front page topic section were not being included in nav

navigation MDL-20735 Activities added to the front page topic section were not being included in nav

webservice MDL-20803 fix xml-rpc documentation, now show the real sent PHP structure + response. REST POST parameters coming soon...

webservice MDL-20803 little hack in order to not trigger environment.php in the header when $USER is set but the user is not logged

portfolio MDL-21079 fixed a regression caused by massive refactoring of where portfolio callers live

For new portfolio formats