Initial draft of profile metadata format & CLI (#17)

* Initial draft of profile metadata format

* Remove records, add Clippy to Nix, fix Clippy error

* Work on profile definition

* BREAKING: Make global settings consistent with profile settings

* Add builder methods & format

* Integrate launching with profiles

* Add profile loading

* Launching via profile, API tweaks, and yak shaving

* Incremental update, committing everything due to personal system maintainance

* Prepare for review cycle

* Remove reminents of experimental work

* CLI: allow people to override the non-empty directory check

* Fix mistake in previous commit

* Handle trailing whitespace and newlines in prompts

* Revamp prompt to use dialoguer and support defaults

* Make requested changes

theseus_cli/src/subcommands/mod.rs

@@ -0,0 +1,17 @@
+use eyre::Result;
+
+mod profile;
+
+#[derive(argh::FromArgs)]
+#[argh(subcommand)]
+pub enum SubCommand {
+    Profile(profile::ProfileCommand),
+}
+
+impl crate::Args {
+    pub async fn dispatch(&self) -> Result<()> {
+        match self.subcommand {
+            SubCommand::Profile(ref cmd) => cmd.dispatch(self).await,
+        }
+    }
+}