Use double/int_least64_t for coordinates to support GPS RTK #83
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GPS RTK modules like Unicore UM9xx have a higher precision for latitude and longitude.
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The README mentions that five decimal digits can be parsed for coordinates. However, GPS RTK modules are built for even higher precision and therefore send eight decimal digits (tested with a UM980 module by Witmotion). This precision gets lost when using
float/int_float32_t. Therefore, this PR introducesminmea_doublewithint_least64_tvalue and scale and uses them for coordinates. The easier way would be adjustingminmea_float, but I didn't want to add overhead to fields that don't need such precision and it would be strange to have a type with that name handled like adouble.Tests are adjusted, README not yet. I can do that if you show interest to actually merge this.