Clarification of the format used for pixits related to CSE-ID, AE-ID, SP-IP,...

Clarification of the format used for pixits related to CSE-ID, AE-ID, SP-IP, APP-ID and resource ID identifiers and correct usage in the code

Signed-off-by: Miguel Angel Reina Ortega <miguelangel.reinaortega@etsi.org>