Allow operator overloading to work with derived FSM implementations

[JulianKemmerer]

ex. wanting to have a FSM implementing the '+' operator.

right now derived FSMs assume built in operators are always combinatorial logic / not themselves FSMs...

Is complicated since havent parsed types to resolve if a particular '+' is the overloaded FSM version until having decided to parse the code as an FSM to begin with... :-/

Work around for now is to make wrapper functions for your operators...