Use uint_least64_t for GeometryType::IdType

Santiago Ospina De Los Ríosrequested to merge
bugfix/fix_uint64_t into master

Use uint_least64_t instead of uint64_t as the underlying type for GeometryType::IdType to improve portability.

uint64_t is an optional type, so uint_least64_t is used to ensure availability across different compilers.

Close #42

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