* Add SyntaxContent editors.
* Configure the default SyntaxContent editor in the "Edit Mode Settings" administration section, instead of XDOM editor
* Use the SyntaxContent editors in the edit templates (for page content) and for TextArea properties
* Modify XWiki#getEditorPreference() to return the prefered SyntaxContent editor (instead of XDOM)
* modify templates/editors/xdom*.vm template to support SyntaxContent input
* Make sure the leading white-space is not trimmed when editing in Wiki mode