Use auto-suggestion on xproperties that can support it

A first batch should be done for: 

 Page suggestion:

• SearchSuggestSource class
  • Service property
• XWikiUsers class
  • Skin property
• XWikiPreferences class
  • Skin property
  • Internationalization Document Bundles property
• WatchListDailyNotifier class
  • Template property
• RedirectClass class
  • Location property
• Registration class
  • Default redirect property
• ConfigurationClass class
  • Configuration class property
• TemplateProviderClass class
  • Template property
• DocumentSheetBinding
  • Sheet property
• ClassSheetBinding class
  • Sheet property
• Invitation.WebHome class
  • Email class property
  • Email container property
• AnnotationClass class
  • Target property

User suggestion:

• Administration Export section
  • Author field
• FeedEntryClass class
  • Author property
• WikiCandidateMemberClass class
  • User name property
  • Reviewer property
• InvitationMailClass class
  • Sending User property
• XWikiComments class
  • Author property
• InvitationMailClass class
  • Sending User property

See https://design.xwiki.org/xwiki/bin/view/Proposal/AutocompleteOnReference for more details.