Fixed and improved various issue in admin module (especially the Role editing which was not working as expected.)

Added CMS_MODULE.permissions to allow module to declare the potential permissions.
Added support for CMS_LINK.is_forbidden, in relation with CMS_LOCAL_LINK.permission_arguments.
Split link "username (Logout)" into 2 links "username" and "logout".
Fixed/Changed the way auth modules alter the logout link based on "(Logout)" title, by safer solution based on `location' of the link.

Fixed usage of WSF_REQUEST.path_info by using percent_encoded_path_info which is not non unicode path info to be used most of the time.
Merged CMS_REPONSE.variables and CMS_REPONSE.values .
When possible, prefer usage of CMS_RESPONSE.user instead of CMS_REQUEST_UTIL.current_user (WSF_REQUEST) whenever it is possible.
When possible, prefer usage of CMS_RESPONSE.location, rather than usage of WSF_REQUEST.(percent_encoded_)path_info .
Code cleaning.

src/service/cms_module.e

@@ -32,6 +32,14 @@ feature -- Access
 	dependencies: detachable LIST [TYPE [CMS_MODULE]]
 			-- Optional dependencies.
 
+	permissions: LIST [READABLE_STRING_8]
+			-- List of permission ids, used by this module, and declared.
+		require
+			is_initialized: is_initialized
+		do
+			create {ARRAYED_LIST [READABLE_STRING_8]} Result.make (0)
+		end
+
 feature {CMS_API} -- Module Initialization
 
 	initialize (api: CMS_API)