Adding descriptions to all functions in OneM2M_Functions file

Renaming of "child" component:
- vc_cseSimu -> vc_cse1
- vc_aeSimu -> vc_ae1 for CseSimu or vc_ae2 for AeSimu

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