p192: define PrimeField constants for FieldElement
#827
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Calculated in `sage` as follows:
sage: p = 0xfffffffffffffffffffffffffffffffeffffffffffffffff
sage: multiplicative_generator = GF(p).primitive_element()
sage: p_minus_1_bin = (p - 1).binary()
sage: s = len(p_minus_1_bin) - len(p_minus_1_bin.rstrip('0')) # count trailing zeros in binary
sage: t = (p - 1) >> s
sage: root_of_unity = pow(multiplicative_generator,t,p)
sage: delta = pow(multiplicative_generator, 2^s, p)
sage: multiplicative_generator
11
sage: p_minus_1_bin
'111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111101111111111111111111111111111111111111111111111111111111111111110'
sage: s
1
sage: hex(t)
'0x7fffffffffffffffffffffffffffffff7fffffffffffffff'
sage: hex(root_of_unity)
'0xfffffffffffffffffffffffffffffffefffffffffffffffe'
sage: delta
121
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Calculated in
sageas follows: