Allow passing a clothing file to LoadAvatar and plStringify whatever we encounter on our way
Implement a plLoadClothingMsg as a clone loading trigger
Add functions for writing and reading avatar clothing files

This also introduces a filename member in plClothingOutfit so it
can determine whether to read the clothing information from the file
or the vault.
Add clothing file functions to the Avatar Python API
Merge pull request #300 from Mystler/newstartup

Avatar clothing files