Rather than running status-left, status-right and window title #() with popen

immediately every redraw, queue them up and run them in the background,
starting each once every status-interval. The actual status line uses the
output from the last run.

This brings several advantages:

- tmux itself may be called from inside #() without causing the server to hang;
- likewise, sleep or similar doesn't cause the server to block;
- commands aren't run excessively often when redrawing;
- commands shared by status-left and status-right, or used multiple times, will
  only be run once.

run-shell and if-shell still use system()/popen() but will be changed over to
use this too later.

cmd-display-message.c

@@ -55,7 +55,7 @@ cmd_display_message_exec(struct cmd *self, struct cmd_ctx *ctx)
 	else
 		template = data->arg;
 
-	msg = status_replace(c->session, template, time(NULL));
+	msg = status_replace(c, template, time(NULL));
 	status_message_set(c, "%s", msg);
 	xfree(msg);