XNAT-4232 Replaced siteConfig as Properties with SiteConfigPreferences.

src/main/java/org/nrg/xapi/rest/settings/SiteConfigApi.java

...va/org/nrg/xnat/turbine/modules/screens/UploadApplet.java

src/main/webapp/xnat-templates/screens/Basic.vm

src/main/webapp/xnat-templates/screens/Index.vm

src/main/webapp/xnat-templates/screens/Login.vm

src/main/webapp/xnat-templates/screens/Page.vm

src/main/webapp/xnat-templates/screens/Register.vm

src/main/webapp/xnat-templates/screens/Scripts.vm

src/main/webapp/xnat-templates/screens/UploadApplet.vm

src/main/webapp/xnat-templates/screens/register_box.vm

src/main/webapp/xnat-templates/screens/topBar/New/Default.vm

...p/xnat-templates/screens/xnat_ctSessionData/edit/scans.vm

...eens/xnat_imageSessionData/xnat_imageSessionData_scans.vm

...reens/xnat_projectData/xnat_projectData_summary_manage.vm

...s/xnat_projectData/xnat_projectData_summary_management.vm