Add ability of a deferred execution of the method

[codestackdev]

OnIdle notification is a safe place to execute commands. Add the option to add-in to hide the complexity of handling the OnIdle and allow any function to be executed from within the first OnIdleNotification after it is put to queue.

ExecuteDeferred(x=>x.SomeFunction(a, b));

Might need to employ lyambda expression for this.