Do not export unusual hash types at crate root

Currently we use a wildcard to export all the hash types in
`hash_types`. We are moving to a world were we only export
normal/standard types from the crate root.

Remove the reexport of the following hash types:

- `FilterHash`
- `FilterHeader`
- `TxMerkleNode`
- `WitnessCommitment`
- `WitnessMerkleNode`
- `XpubIdentifier`
- `Sighash`

Fix: #1541

bitcoin/src/bip152.rs

@@ -376,9 +376,9 @@ mod test {
     use crate::blockdata::locktime::absolute;
     use crate::consensus::encode::{deserialize, serialize};
     use crate::hashes::hex::FromHex;
+    use crate::hash_types::TxMerkleNode;
     use crate::{
-        CompactTarget, OutPoint, ScriptBuf, Sequence, Transaction, TxIn, TxMerkleNode, TxOut, Txid,
+        CompactTarget, OutPoint, ScriptBuf, Sequence, Transaction, TxIn, TxOut, Txid, Witness,
-        Witness,
     };
 
     fn dummy_tx(nonce: &[u8]) -> Transaction {

bitcoin/src/blockdata/transaction.rs

@@ -568,7 +568,8 @@ impl<E> EncodeSigningDataResult<E> {
     ///
     /// ```rust
     /// # use bitcoin::consensus::deserialize;
-    /// # use bitcoin::{Transaction, Sighash};
+    /// # use bitcoin::Transaction;
+    /// # use bitcoin::hash_types::Sighash;
     /// # use bitcoin_hashes::{Hash, hex::FromHex};
     /// # let mut writer = Sighash::engine();
     /// # let input_index = 0;

bitcoin/src/lib.rs

@@ -137,7 +137,7 @@ pub use crate::consensus::encode::VarInt;
 pub use crate::crypto::key::{self, PrivateKey, PublicKey};
 pub use crate::crypto::{ecdsa, schnorr};
 pub use crate::error::Error;
-pub use crate::hash_types::*;
+pub use crate::hash_types::{Txid, Wtxid, BlockHash, PubkeyHash,  ScriptHash, WPubkeyHash, WScriptHash};
 pub use crate::merkle_tree::MerkleBlock;
 pub use crate::network::constants::Network;
 pub use crate::pow::{CompactTarget, Target, Work};

bitcoin/src/sighash.rs

@@ -12,12 +12,13 @@ use core::borrow::Borrow;
 use core::ops::{Deref, DerefMut};
 use core::{fmt, str};
 
-use crate::{io, Script, ScriptBuf, Transaction, TxIn, TxOut, Sequence, Sighash};
+use crate::{io, Script, ScriptBuf, Transaction, TxIn, TxOut, Sequence};
 use crate::blockdata::transaction::EncodeSigningDataResult;
 use crate::blockdata::witness::Witness;
 use crate::consensus::{encode, Encodable};
 use crate::error::impl_std_error;
 use crate::hashes::{sha256, sha256d, Hash};
+use crate::hash_types::Sighash;
 use crate::prelude::*;
 use crate::taproot::{LeafVersion, TapLeafHash, TapSighashHash, TAPROOT_ANNEX_PREFIX};