All tools in this directory are built with nix, a declarative package manager
which gives a secure and predictable bundling of dependencies.
They are defined as attributes in the ./overlay.nix file,
which in turn imports the default.nix file of each tool.
The dependencies of each tool is set as buildInputs in the default.nix file.
dapp and seth are similarly structured as a collection of short scripts, mostly written in bash.
The main entrypoint for any invocation of seth or dapp is a dispatch script,
./src/seth/libexec/seth/seth and ./src/dapp/libexec/dapp/dapp respectively, which parses any
flags given, setting their values to the appropriate environment variable, and dispatches to the
appropriate subcommand.