finish applying port autoconnect refactor, move entry point to top level, update usage

.old/todo_cli_mixer.rs

@@ -0,0 +1,25 @@
+include!("./lib.rs");
+
+pub fn main () -> Usually<()> {
+    MixerCli::parse().run()
+}
+
+#[derive(Debug, Parser)] #[command(version, about, long_about = None)] pub struct MixerCli {
+    /// Name of JACK client
+    #[arg(short, long)] name: Option<String>,
+    /// Number of tracks
+    #[arg(short, long)] channels: Option<usize>,
+}
+
+impl MixerCli {
+    fn run (&self) -> Usually<()> {
+        Tui::run(JackConnection::new("tek_mixer")?.activate_with(|jack|{
+            let mut mixer = Mixer::new(jack, self.name.as_ref().map(|x|x.as_str()).unwrap_or("mixer"))?;
+            for channel in 0..self.channels.unwrap_or(8) {
+                mixer.track_add(&format!("Track {}", channel + 1), 1)?;
+            }
+            Ok(mixer)
+        })?)?;
+        Ok(())
+    }
+}