Initial merge changes

Added Execution Payload from Rayonism Fork

Updated new Containers to match Merge Spec

Updated BeaconBlockBody for Merge Spec

Completed updating BeaconState and BeaconBlockBody

Modified ExecutionPayload<T> to use Transaction<T>

Mostly Finished Changes for beacon-chain.md

Added some things for fork-choice.md

Update to match new fork-choice.md/fork.md changes

ran cargo fmt

Added Missing Pieces in eth2_libp2p for Merge

fix ef test

Various Changes to Conform Closer to Merge Spec

consensus/tree_hash/src/impls.rs

@@ -1,5 +1,5 @@
 use super::*;
-use ethereum_types::{H256, U128, U256};
+use ethereum_types::{H160, H256, U128, U256};
 
 fn int_to_hash256(int: u64) -> Hash256 {
     let mut bytes = [0; HASHSIZE];
@@ -126,6 +126,28 @@ impl TreeHash for U256 {
     }
 }
 
+impl TreeHash for H160 {
+    fn tree_hash_type() -> TreeHashType {
+        TreeHashType::Vector
+    }
+
+    fn tree_hash_packed_encoding(&self) -> Vec<u8> {
+        let mut result = vec![0; 32];
+        result[0..20].copy_from_slice(self.as_bytes());
+        result
+    }
+
+    fn tree_hash_packing_factor() -> usize {
+        1
+    }
+
+    fn tree_hash_root(&self) -> Hash256 {
+        let mut result = [0; 32];
+        result[0..20].copy_from_slice(self.as_bytes());
+        Hash256::from_slice(&result)
+    }
+}
+
 impl TreeHash for H256 {
     fn tree_hash_type() -> TreeHashType {
         TreeHashType::Vector