Removed obsolete calls, harmonized predefine response, added non admin user pages.

When access is denied, also provide when possible and wanted, the needed
permissions so that in the future, user will be able to ask for
permission easily.
Renamed previous user handlers as admin user handlers.
Added non admin user handler /user/{uid} .
Add new `send_...` response to `CMS_API.response_api`, and use them
instead of `create {...RESPONSE}.... ; execute`.
Fixed potential issue with storage mailer initialization if folder does
not exist.
Added utf_8_encoded helpers function on CMS_API interface.
Fixed a few unicode potential issues.
Removed a few obsolete calls.

modules/google_search_20/src/google_custom_search_module_20.e

@@ -57,15 +57,13 @@ feature -- GCSE Keys
 
 	gcse_cx_key (api: CMS_API): detachable READABLE_STRING_8
 			-- Get google custom search engine id.
-		local
-			utf: UTF_CONVERTER
 		do
 			if attached api.module_configuration (Current, Void) as cfg then
 				if
 					attached cfg.text_item ("gcse.search_engine_id") as l_gcse_cx_key and then
 					not l_gcse_cx_key.is_empty
 				then
-					Result := utf.utf_32_string_to_utf_8_string_8 (l_gcse_cx_key)
+					Result := api.utf_8_encoded (l_gcse_cx_key)
 				end
 			end
 		end