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This PR removes unused curves:
brainpool family (160..512 bits)
frp_v1
gost_A
NIST curves: p192..p521
x9.62
sm2p_v1
Curves that are to be removed have low (if any) coverage with tests, some have missing parameters and are not used widely in ZK.
The curves that remain are:
mnt4 and mnt6 (298 bits) Security of MNT curves is 77 and 87 bits respectively
bls12-381 and bls12-377
alt_bn128
pallas and vesta
families of secp_k1 and secp_r1 (160..521 bits)
curve25519 and ed25519
jubjub and babyjubjub
closes #319