add assets, fix coloring, update readme and art tools

artTools/README.md

artTools/normalize_svg.py

artTools/vector_deepmurk_scud.svg

src/art/vector/VectorArtJS.js

src/art/vector/layers/Art_Vector_Cat_Ear_Back.svg

src/art/vector/layers/Art_Vector_Cat_Ear_Fore.svg

src/art/vector/layers/Art_Vector_Cat_Tail.svg

src/art/vector/layers/Art_Vector_Elf_Ear_Back.svg

src/art/vector/layers/Art_Vector_Elf_Ear_Fore.svg

src/art/vector/layers/Art_Vector_Face_Fur_Feline.svg