Reworked the hierarchical state machine processing in terms of sub
processing.
Now, the declaration and usage of subs is completely understandable and
easy to implement.
I am excited to see how end-users will see the possibilities.
ProcessStop is called for each process that is destructed... Actually, I
need to implement destructors upon a garbage collection event. Found the
method to do that, but need to implement it ... Next time ...
