RNG-169: Update array seed conversion to use optimum seed length

RNG-169: Update array seed conversion to use optimum seed length

Avoid duplication of the input byte[] to zero fill it to a length
modulus 4 or 8 for conversion by the NumberFactory.

During array to array conversions only convert the minimum of the
required number of bytes for the native seed type, or the number of
input bytes.

Change all array conversions to use little-endian byte order.