Returns the execution time (in milliseconds) of the last call to STATE_engine_render().
Through this number one can calculate the current fps (frames per second)
t=STATE_engine_get_last_render_execution_time()
if (t==0) return(0); STATE_engine_render() wasnt called even once. protect against division by zero
fps=1000/t;
see also STATE_engine_get_average_render_execution_time()
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