core.Base: timeout()

We have many classes which are using either Neo.timeout() or setTimeout(). Since instances can literally get destroyed at any moment, it would be nice if timeout callbacks would automatically get removed (via clearTimeout()).

To resolve this:

• core.Base needs a new timeout() method
• once called it should store the returned timeoutId inside an instance based array
• once a timeout is done, it needs to remove its id from the internal array
• the function needs to return a Promise, so that we can use await me.timeout(50);
• destroy() needs to check for timeoutIds first and clear them

@ExtAnimal: did I get your idea right?