Author: Petr Škoda
MDL-34955 add full TinyMCE subplugin management
http://git.moodle.org/gw?p=moodle.git;a=commit;h=0b7858221c3e3f6445e8d2d93e0efac6129b135d
http://github.com/moodle/moodle/commit/0b7858221c3e3f6445e8d2d93e0efac6129b135d
+ 2.4 en [availablebuttons,editor_tinymce]
+ 2.4 en [customtoolbar_desc,editor_tinymce]
+ 2.4 en [subplugintype_tinymce_plural,editor_tinymce]