The Atto preview plugin does not support Moodle filters. This commit
disables it for now with the intent that in a future release we may
replace it with a Moodle version which applies our filters correctly.
The template plugin is a part of Tiny, and requires us to create an
administrator UI to configure the templates.
This requires much more thought on workflows, intent, and so on so we'll
park it for later.
Part of MDL-75966.
Part of MDL-75966
This commit adds TinyMCE version 6.1 into Moodle core.
A basic editor implementation is included, along with Moodle loader, and
basic Plugin API for Moodle. The Plugin API will be extended and
improved in future changes.
A new subplugin is defined for this plugin.
Huong Nguyen