Added webapi system and first attempt for the core webapi.

Added user profile system to the core module.
Moved /user/{uid} from auth module to core module.
Added possibility to add html before and after a cms form. (useful to add a form before or after, as nested form are forbidden).
Now theme can be installed using roc install command.

src/service/cms_administrable.e

@@ -6,29 +6,8 @@ note
 deferred class
 	CMS_ADMINISTRABLE
 
-feature -- Administration
-
-	module_administration: like administration
-			-- Associated administration module.
-		do
-			Result := internal_module_administration
-			if Result = Void then
-				Result := administration
-				internal_module_administration := Result
-			end
-		end
-
-feature {NONE} -- Implementation
-
-	internal_module_administration: detachable like module_administration
-			-- Cached version of `module_administration`.
-
-feature {NONE} -- Administration
-
-	administration: CMS_MODULE_ADMINISTRATION [CMS_MODULE]
-			-- Administration module.
-		deferred
-		end
+inherit
+	CMS_WITH_MODULE_ADMINISTRATION
 
 note
 	copyright: "2011-2017, Jocelyn Fiat, Javier Velilla, Eiffel Software and others"