Merge archtrack scripts into the project root.
Rename build.sh to build.
list: Adapt to BlackArch's structure.

This removes some list items and looks for PKGBUILD files in the correct
locations.
Remove 'combo-list' script.

It's absolutely useless.
Remove 'dist' script.
install-deps: Adapt to BlackArch.

This fixes package searching and simplifies things a bit.
prep-packages: Clean up, make features more relevant to BlackArch.