Add noalpha preview graphics for minicore

In the directories
mods/minicore/images/avatar/male/preview
mods/minicore/images/avatar/female/preview

run this script:

mkdir noalpha
mkdir noalpha1
mkdir noalpha2
for f in $(ls *.png)
do
    convert ${f} -background \#111111 -flatten noalpha1/${f}
    convert noalpha1/${f} -fill \#FF00FF -opaque \#111111 noalpha2/${f}
    advpng -z4 noalpha2/${f}
    optipng  -zc1-9 -zm1-9 -zs0-3 -f0-5 noalpha2/${f}
    pngcrush -rem alla -rem text noalpha2/${f} noalpha/${f}
done
rm -rf noalpha1
rm -rf noalpha2