Custom Rat Skin updates

We will not be adding any more custom rat skins until Rats2 is later in development. Rats2 will be the recoded, retextured, re-everything'ed version of Rats, and will take some time to develop.

However, once the mod is sufficiently developed we will begin to both update the already added Rats skins and add new requested Rats skins as well. Thank you for your patience.