The `xshell` crate provides a more convenient way to build and run a `Command`, which is more similar to traditional bash scripts. Using this crate, we can simplify our `run.rs` script while still being platform-independent and not requiring any external dependencies. We can also still run the examples using `cargo run --example`.
Removes the separate `dora-runtime` binary. The runtime can now be started by passing `--run-dora-runtime` to `dora-daemon`. This change makes setup and deployment easier since it removes one executable that needs to be copied across machines.