Rustpkg is a revamp of Cargo that brings awesome new features such as a build system described in build scripts.
It's a purely functional package manager that has no central sources of any kind,
but rather installs via URLs. It's similar to how Go's go get tool works, except
Rustpkg requires a central metadata file (pkg.rs) in the repository, archive or folder
in order to figure out how to build the package. This is a side effect of Rustpkg
allowing multiple crates to be defined in a single package (i.e. a package is defined
as a set of crates rather than a package being exactly the same as one crate).
There's a plan to make it so the pkg.rs is not needed for single-crate packages,
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