wip: running interface in separate or combined mode

also disassociating render functions from state structs

src/cli.rs

@@ -0,0 +1,22 @@
+use clap::{Parser, Subcommand};
+
+#[derive(Debug, Parser)]
+#[command(version, about, long_about = None)]
+pub struct Cli {
+    #[command(subcommand)]
+    pub command: Option<Command>
+}
+
+#[derive(Debug, Clone, Subcommand)]
+pub enum Command {
+    /// Launch or control a master transport
+    Transport,
+    /// Launch or control a mixer
+    Mixer,
+    /// Launch or control a looper
+    Looper,
+    /// Launch or control a sampler
+    Sampler,
+    /// Launch or control a sequencer
+    Sequencer,
+}