Short.G.Pro.ObservableMutable.X.Basic

On change subscription

Adds given function as listener to property change events

   val pro = String.Pro.OM("foo")

   // event subscription
   pro.onChange(() => "Change Detected".tp)

   // library based event subscription
   pro.onValueChangeWithOld((v, old) => "Value changed from " + old + " to " + v tp()))

   pro() = "bar"

   // Output
   Value changed from foo to bar
   Change Detected

Make String

tag returns this instance String representation, which should be used insted of toString