Redo primitives, abi

Consolidates all primitives into a single crate. We didn't benefit from its
fragmentation. I'm hesitant to say the new internal-organization is better (it
may be just as clunky), but it's at least in a single crate (not spread out
over micro-crates).

The ABI is the most distinct. We now entirely own it. Block header hashes don't
directly commit to any BABE data (avoiding potentially ~4 KB headers upon
session changes), and are hashed as borsh (a more widely used codec than
SCALE). There are still Substrate variants, using SCALE and with the BABE data,
but they're prunable from a protocol design perspective.

Defines a transaction as a Vec of Calls, allowing atomic operations.

substrate/abi/src/genesis_liquidity.rs

@@ -1,20 +1,50 @@
-pub use serai_genesis_liquidity_primitives as primitives;
+use borsh::{BorshSerialize, BorshDeserialize};
 
-use serai_primitives::*;
-use primitives::*;
+use serai_primitives::{
+  crypto::Signature, address::SeraiAddress, balance::ExternalBalance, genesis::GenesisValues,
+};
 
-#[derive(Clone, PartialEq, Eq, Debug, scale::Encode, scale::Decode, scale_info::TypeInfo)]
-#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
+/// A call to the genesis liquidity.
+#[derive(Clone, PartialEq, Eq, Debug, BorshSerialize, BorshDeserialize)]
 pub enum Call {
-  remove_coin_liquidity { balance: ExternalBalance },
-  oraclize_values { values: Values, signature: Signature },
+  /// Oraclize the value of non-Bitcoin external coins relative to Bitcoin.
+  oraclize_values {
+    /// The values of the non-Bitcoin external coins.
+    values: GenesisValues,
+    /// The signature by the genesis validators for these values.
+    signature: Signature,
+  },
+  /// Remove liquidity.
+  remove_liquidity {
+    /// The genesis liquidity to remove.
+    balance: ExternalBalance,
+  },
 }
 
-#[derive(Clone, PartialEq, Eq, Debug, scale::Encode, scale::Decode, scale_info::TypeInfo)]
-#[cfg_attr(feature = "borsh", derive(borsh::BorshSerialize, borsh::BorshDeserialize))]
-#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
-pub enum Event {
-  GenesisLiquidityAdded { by: SeraiAddress, balance: ExternalBalance },
-  GenesisLiquidityRemoved { by: SeraiAddress, balance: ExternalBalance },
-  GenesisLiquidityAddedToPool { coin: ExternalBalance, sri: Amount },
+impl Call {
+  pub(crate) fn is_signed(&self) -> bool {
+    match self {
+      Call::oraclize_values { .. } => false,
+      Call::remove_liquidity { .. } => true,
+    }
+  }
+}
+
+/// An event from the genesis liquidity.
+#[derive(Clone, PartialEq, Eq, Debug, BorshSerialize, BorshDeserialize)]
+pub enum Event {
+  /// Genesis liquidity added.
+  GenesisLiquidityAdded {
+    /// The recipient of the genesis liquidity.
+    recipient: SeraiAddress,
+    /// The coins added as genesis liquidity.
+    balance: ExternalBalance,
+  },
+  /// Genesis liquidity removed.
+  GenesisLiquidityRemoved {
+    /// The account which removed the genesis liquidity.
+    origin: SeraiAddress,
+    /// The amount of genesis liquidity removed.
+    balance: ExternalBalance,
+  },
 }