CMS-2421 Create SiteWizardPanel
Added sendAndParse methods to CreateSiteRequest and UpdateSiteRequest
CMS-2421 Create SiteWizardPanel
Removed SiteWizardPanel and instead making ContentWizardPanel aware of the site
It became too difficult overriding the methods in SiteWizardPanel - even though it's not currently  a nice result in ContentWizardPanel either.
But hopefully this will  be improved.