[Suggestion] Customization for skins (peds and CJ)

[vico]

• Be able to set per-skin walking styles (mostly for those who wants to keep the walking style for default peds but fix the peds with rollers);
  
  
• Change CJ (skin ID 0) clothing and stats like fatness and buffness, like MTA does (the function can return a different value if it can't change the clothing/body value due to the player have other ped as a skin).
  
  
• Be able to add CJs with different body stats and clothing in AddPlayerClass.