Remove Monero as a dependency

Introduces missing CLSAG checks. The only difference now should be the 
additional rejection of torsioned points, which is relevant to 
https://github.com/serai-dex/serai/issues/25. Considering this is only 
currently used for FROST verification, this should be fine.

Closes https://github.com/serai-dex/serai/issues/19 by making it 
irrelevant.

Increases priority of https://github.com/serai-dex/serai/issues/68, as 
now it's used for the BP generators which are done at first-proof.

Also merges BP's stricter hash_to_point with the library's, since CLSAG 
has the same bound.

coins/monero/src/tests/bulletproofs.rs

@@ -1,21 +0,0 @@
-use rand::rngs::OsRng;
-
-use crate::{Commitment, random_scalar, ringct::bulletproofs::Bulletproofs};
-
-#[test]
-fn bulletproofs() {
-  // Create Bulletproofs for all possible output quantities
-  for i in 1 .. 17 {
-    let commitments =
-      (1 ..= i).map(|i| Commitment::new(random_scalar(&mut OsRng), i)).collect::<Vec<_>>();
-
-    assert!(Bulletproofs::new(&mut OsRng, &commitments)
-      .unwrap()
-      .verify(&mut OsRng, &commitments.iter().map(Commitment::calculate).collect::<Vec<_>>()));
-  }
-
-  // Check it errors if we try to create too many
-  assert!(
-    Bulletproofs::new(&mut OsRng, &[Commitment::new(random_scalar(&mut OsRng), 1); 17]).is_err()
-  );
-}

coins/monero/src/tests/clsag.rs

@@ -74,8 +74,6 @@ fn clsag() {
     )
     .swap_remove(0);
     clsag.verify(&ring, &image, &pseudo_out, &msg).unwrap();
-    #[cfg(feature = "experimental")]
-    clsag.rust_verify(&ring, &image, &pseudo_out, &msg).unwrap();
   }
 }
 

coins/monero/src/tests/hash_to_point.rs

@@ -1,16 +0,0 @@
-use rand::rngs::OsRng;
-
-use curve25519_dalek::constants::ED25519_BASEPOINT_TABLE;
-
-use crate::{
-  random_scalar,
-  ringct::hash_to_point::{hash_to_point as c_hash_to_point, rust_hash_to_point},
-};
-
-#[test]
-fn hash_to_point() {
-  for _ in 0 .. 50 {
-    let point = &random_scalar(&mut OsRng) * &ED25519_BASEPOINT_TABLE;
-    assert_eq!(rust_hash_to_point(point.compress().to_bytes()), c_hash_to_point(point));
-  }
-}

coins/monero/src/tests/mod.rs

@@ -1,4 +1,2 @@
-mod hash_to_point;
 mod clsag;
-mod bulletproofs;
 mod address;