Moved all location related queries into CMS_API, instead of CMS_SETUP.

Note that CMS_SETUP provides locations set by default or from configuration file.
Now theme related resources can be found under site/modules/$mod_name/... or site/themes/$theme/modules/...
  so only theme related resources can be overriden for now.

examples/demo/modules/blog/handler/blog_user_handler.e

@@ -86,8 +86,6 @@ feature -- Query
 			-- User id from path /blogs/{user}.
 			-- Unsigned integer since negative ids are not allowed.
 			-- If no valid id can be read it returns -1
-		local
-			s: STRING
 		do
 			Result := -1
 			if attached {WSF_STRING} req.path_parameter ("user") as l_user_id then