ff 0.13 (#269)

* Partial move to ff 0.13

It turns out the newly released k256 0.12 isn't on ff 0.13, preventing further
work at this time.

* Update all crates to work on ff 0.13

The provided curves still need to be expanded to fit the new API.

* Finish adding dalek-ff-group ff 0.13 constants

* Correct FieldElement::product definition

Also stops exporting macros.

* Test most new parts of ff 0.13

* Additionally test ff-group-tests with BLS12-381 and the pasta curves

We only tested curves from RustCrypto. Now we test a curve offered by zk-crypto,
the group behind ff/group, and the pasta curves, which is by Zcash (though
Zcash developers are also behind zk-crypto).

* Finish Ed448

Fully specifies all constants, passes all tests in ff-group-tests, and finishes moving to ff-0.13.

* Add RustCrypto/elliptic-curves to allowed git repos

Needed due to k256/p256 incorrectly defining product.

* Finish writing ff 0.13 tests

* Add additional comments to dalek

* Further comments

* Update ethereum-serai to ff 0.13

coins/monero/generators/src/hash_to_point.rs

@@ -13,7 +13,7 @@ pub fn hash_to_point(bytes: [u8; 32]) -> EdwardsPoint {
   let A = FieldElement::from(486662u64);
 
   let v = FieldElement::from_square(hash(&bytes)).double();
-  let w = v + FieldElement::one();
+  let w = v + FieldElement::ONE;
   let x = w.square() + (-A.square() * v);
 
   // This isn't the complete X, yet its initial value