Implement Generic spinboxes handling numpy types int/uint/float

Merged Flavio TARSETTI requested to merge 212_generic_spinboxes_numpy_types_int_uint_float into v2

Summary

This merge request implements the generic spinbox handling numpy types (int/uint/float)

Relevant issue(s) fixed

Fixes #212 (closed)

Edited by Flavio TARSETTI

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