Update: Add flags to the f_state_t.

Update: Add flags to the f_state_t.

Set the flag size to 32-bit as 16-bits is often small for bitwise flags.

I try to keep structures like f_state_t as minimal as possible.
However, I feel that I need to pass information to functions to allow for more flexibility.
I have mixed opinions on this as this encroaches on the Keep It Simple concepts.
However, after consideration, I believe some of this complexity is necessary for the upcoming stable release.

Future development branches will be free to change this as the project exposes the good and the bad of such a decision.