Remove old DB crates, start fixing fork_choice

beacon_node/db/src/impls.rs

@@ -0,0 +1,30 @@
+use crate::*;
+use ssz::{Decode, Encode};
+
+impl StoreItem for BeaconBlock {
+    fn db_column() -> DBColumn {
+        DBColumn::BeaconBlock
+    }
+
+    fn as_store_bytes(&self) -> Vec<u8> {
+        self.as_ssz_bytes()
+    }
+
+    fn from_store_bytes(bytes: &mut [u8]) -> Result<Self, Error> {
+        Self::from_ssz_bytes(bytes).map_err(Into::into)
+    }
+}
+
+impl<T: EthSpec> StoreItem for BeaconState<T> {
+    fn db_column() -> DBColumn {
+        DBColumn::BeaconState
+    }
+
+    fn as_store_bytes(&self) -> Vec<u8> {
+        self.as_ssz_bytes()
+    }
+
+    fn from_store_bytes(bytes: &mut [u8]) -> Result<Self, Error> {
+        Self::from_ssz_bytes(bytes).map_err(Into::into)
+    }
+}