Update function prototypes to use ufsm_status_t

[samfriedman93]

This fixes compiler errors for conflicting function types and incompatible pointer type warnings.

[codecov]

Codecov Report

Merging #23 (048afd4) into master (f02f0df) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #23   +/-   ##
=======================================
  Coverage   99.16%   99.16%           
=======================================
  Files           4        4           
  Lines         480      480           
=======================================
  Hits          476      476           
  Misses          4        4           

Impacted Files	Coverage Δ
src/ufsm_queue.c	100.00% <100.00%> (ø)
src/ufsm_stack.c	100.00% <100.00%> (ø)

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