Feature request: Unsigned integers

[Timple]

Would it make sense to allow uint as a type, next to int?

It would reduce this:

    buttons:
      type: int_array
      validation:
        lower_element_bounds<>: 0

To this:

    buttons:
      type: uint_array

So internally it could do a sanity check on the sign and (for c++) cast to an uint32_t.