Notification of string changes

Author: Damyon Wiese
MDL-43853 Atto: Performance. Turbocharge the loader.
Rewrite the atto plugin loader so that:

A) We have a real settings.php page and can edit the toolbar.
B) All plugins are loaded at the same time (not serially)
C) All plugins share the YUI sandbox (more performance boost).

I had to change the loading API for this - but there are not non-core uses yet,
this is the best time to break it.


http://git.moodle.org/gw?p=moodle.git;a=commit;h=55c0403c6c62d788e1e3e06c4a25b57bcdb196b0
http://github.com/moodle/moodle/commit/55c0403c6c62d788e1e3e06c4a25b57bcdb196b0

+ 2.7 en [subplugintype_atto,editor_atto]
+ 2.7 en [settings,editor_atto]
+ 2.7 en [toolbarconfig,editor_atto]
+ 2.7 en [toolbarconfig_desc,editor_atto]