Allow selection of Joomla default wysiwyg editor

Joomla global configuration includes the option of selecting a default WYSIWYG editor which can be used globally. Currently, CiviCRM only includes the ability to select from the pre-packaged TinyMCE and CKEditors that ship with Civi. For Joomla users, there is great benefit in using the default editor, as it creates more consistency across site administration, and several editors have very useful tools geared toward the Joomla environment (creating links to internal Joomla resources, file and image browsing, ACL controls for editor buttons, etc.).

Spec:

• add new option_value for Joomla Default Editor
• unset value for Drupal users in global settings > preferences
• create class to inject editor and pass CiviCRM parameters/attributes to Joomla method