timeout now a flag on the root command.

It applies to all messages sent

new option function WithTimeout added

internal/xair/option.go

@@ -1,5 +1,7 @@
 package xair
 
+import "time"
+
 type Option func(*engine)
 
 func WithKind(kind string) Option {
@@ -8,3 +10,9 @@ func WithKind(kind string) Option {
 		e.addressMap = addressMapForMixerKind(e.Kind)
 	}
 }
+
+func WithTimeout(timeout time.Duration) Option {
+	return func(e *engine) {
+		e.timeout = timeout
+	}
+}