Publish an alpha version of the Monero crate (#123)

* Label the version as an alpha

* Add versions to Cargo.tomls

* Update to Zeroize 1.5

* Drop patch versions from monero-serai Cargo.toml

* Add a repository field

* Move generators to OUT_DIR

IIRC, I didn't do this originally as it constantly re-generated them. 
Unfortunately, since cargo is complaining about .generators, we have to.

* Remove Timelock::fee_weight

Transaction::fee_weight's has a comment, "Assumes Timelock::None since 
this library won't let you create a TX with a timelock". Accordingly, 
this is dead code.

crypto/frost/src/lib.rs

@@ -3,7 +3,7 @@ use std::{io::Read, sync::Arc, collections::HashMap};
 
 use thiserror::Error;
 
-use zeroize::Zeroize;
+use zeroize::{Zeroize, ZeroizeOnDrop};
 
 use group::{
   ff::{Field, PrimeField},
@@ -160,6 +160,7 @@ impl<C: Curve> Drop for FrostCore<C> {
     self.zeroize()
   }
 }
+impl<C: Curve> ZeroizeOnDrop for FrostCore<C> {}
 
 impl<C: Curve> Debug for FrostCore<C> {
   fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
@@ -287,6 +288,7 @@ impl<C: Curve> Drop for FrostKeys<C> {
     self.zeroize()
   }
 }
+impl<C: Curve> ZeroizeOnDrop for FrostKeys<C> {}
 
 // View of keys passable to algorithm implementations
 #[derive(Clone, Zeroize)]
@@ -304,6 +306,7 @@ impl<C: Curve> Drop for FrostView<C> {
     self.zeroize()
   }
 }
+impl<C: Curve> ZeroizeOnDrop for FrostView<C> {}
 
 impl<C: Curve> FrostKeys<C> {
   pub fn new(core: FrostCore<C>) -> FrostKeys<C> {