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/Cargo.toml

@@ -6,9 +6,6 @@ license = "MIT"
 authors = ["Luke Parker <lukeparker5132@gmail.com>"]
 edition = "2021"
 
-[build-dependencies]
-cc = "1.0"
-
 [dependencies]
 hex-literal = "0.3"
 lazy_static = "1"
@@ -45,7 +42,6 @@ monero = "0.16"
 reqwest = { version = "0.11", features = ["json"] }
 
 [features]
-experimental = []
 multisig = ["rand_chacha", "blake2", "transcript", "frost", "dleq"]
 
 [dev-dependencies]