native 16bit int and large floats fix #77
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On a processor where an int is 16 bit, the max float value will be capped to 32767 due to type conversions. The PRINTF_MAX_FLOAT define is meant to prevent this limitation being exposed but it was written with 32 bit ints in mind (PRINTF_MAX_FLOAT default of 1e9 is less than int32 max of 2,147,483,647). Explicitly setting the conversion type to int32_t fixes this. Added a note in readme against the define as a gotcha.