remove cli frontend in favour of cli subcommand (#278)

this removes the cli frontend entirely, replacing it with a subcommand instead

src/client.rs

@@ -199,6 +199,13 @@ impl ClientManager {
         }
     }
 
+    /// update the enter hook command of the client
+    pub(crate) fn set_enter_hook(&self, handle: ClientHandle, enter_hook: Option<String>) {
+        if let Some((c, _s)) = self.clients.borrow_mut().get_mut(handle as usize) {
+            c.cmd = enter_hook;
+        }
+    }
+
     /// set resolving status of the client
     pub(crate) fn set_resolving(&self, handle: ClientHandle, status: bool) {
         if let Some((_, s)) = self.clients.borrow_mut().get_mut(handle as usize) {