Restored Scientist model addon

This one is more of a patch/fix rather than a restoration. During development, Valve decided to tweak the final scientists before release due to unknown reasons (Original Render), this model reverts said alterations, along with fixing most of the issues the model haves, with a bit of retexturing to recover most of the details that were lost from such modifications before the official release.

What I've done so far:

-Restored the original proportions
-Restored the original UV's
-Restored the wrinkles on the back of the labcoat (recovered from the MP variant)
-Painted back the golden buckle on the scientist's belt (lost due to downsampling the original texture)

-Heads:

*Walter - Fixed mouth UV's, remodelled it's interiors so teeth can properly show up
*Einstein - Fixed mouth's rigging & UV's, readded teeths, remade interiors from scratch, fixed uv's overall.
*Luther - Fixed UV's overall, teeth fix, edited the face texture to get rid of his "derpy look", changed his skin tone to match the intended color (used hands' skintone as base), can revert it back to normal if enough people complain about it.
*Slick - Remade the lower-half of his face, remade the mouth interiors, remade the uv's overall, teeth fix.