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.

dev_modules/masquerade_auth/masquerade_auth_module.e

@@ -183,10 +183,10 @@ feature {NONE} -- Implementation: routes
 					create {BAD_REQUEST_ERROR_CMS_RESPONSE} r.make (req, res, api)
 					r.add_block (login_block ("login", "Wrong username", r), "content")
 				end
+				r.execute
 			else
-				create {FORBIDDEN_ERROR_CMS_RESPONSE} r.make (req, res, api)
+				api.response_api.send_access_denied (Void, req, res)
 			end
-			r.execute
 		end
 
 feature -- Hooks configuration