CURRIKI-6056 : PROJECT: Activate Wysiwyg 2.0 instead of TinyMCE

Updated SimpleHTMLResoure wysiwyg loading, parameter convertInput=false
requered for xhtml/1.0 syntax. The contents of the wysiwyg editor are
sent correctly in slp_text now, no need to js post processing.
Added xwiki/2.1 syntax to TextAssetClass.syntax, and now
SimpleWikiResource is saved with syntax xwiki/2.1 by default.
Updated the displayers for text assets, wysiwyg editor loaded on edit
and added support for xwiki/2.1 on view mode.
Also removed not needed .xml files from wiki module
/resource/CreateResources.