EZP-21191: enable string 'null' as null value alias
EZP-21191: implemented HTML5 edit test bundle
EZP-21191: RichText field type initial implementation
Implemented EZP-21317: Create XML schema for XHTML5 input

Conflicts:
	eZ/Bundle/EzPublishCoreBundle/Resources/config/fieldtypes.yml
EZP-21191: implemented REST RichText field type processor
EZP-21191: registered ezrichtext search field