examples: Clean up import statements

Examples are meant to showcase how to use `miniscript`; software using
`miniscript` as a dependency should not need to depend directly on
`bitcoin` since we re-export it from the `miniscript` crate root. Our
examples are more applicable if they do not assume a dependency on
`bitcoin` exists.

Use `use miniscript::bitcoin` to get at types/functions in `bitcoin`.

Author: tcharding

examples/htlc.rs

@@ -5,7 +5,7 @@
 
 use std::str::FromStr;
 
-use bitcoin::Network;
+use miniscript::bitcoin::Network;
 use miniscript::descriptor::Wsh;
 use miniscript::policy::{Concrete, Liftable};
 

examples/psbt_sign_finalize.rs

@@ -3,13 +3,13 @@
 use std::collections::BTreeMap;
 use std::str::FromStr;
 
-use bitcoin::sighash::SighashCache;
-use bitcoin::{base64, PrivateKey};
 use miniscript::bitcoin::consensus::encode::deserialize;
 use miniscript::bitcoin::hashes::hex::FromHex;
-use miniscript::bitcoin::psbt::PartiallySignedTransaction as Psbt;
+use miniscript::bitcoin::psbt::{self, Psbt};
+use miniscript::bitcoin::sighash::SighashCache;
 use miniscript::bitcoin::{
-    self, psbt, secp256k1, Address, Network, OutPoint, Script, Sequence, Transaction, TxIn, TxOut,
+    self, base64, secp256k1, Address, Network, OutPoint, PrivateKey, Script, Sequence, Transaction,
+    TxIn, TxOut,
 };
 use miniscript::psbt::{PsbtExt, PsbtInputExt};
 use miniscript::Descriptor;

examples/taproot.rs

@@ -3,10 +3,10 @@
 use std::collections::HashMap;
 use std::str::FromStr;
 
-use bitcoin::address::WitnessVersion;
-use bitcoin::key::XOnlyPublicKey;
-use bitcoin::secp256k1::{rand, KeyPair};
-use bitcoin::Network;
+use miniscript::bitcoin::address::WitnessVersion;
+use miniscript::bitcoin::key::{KeyPair, XOnlyPublicKey};
+use miniscript::bitcoin::secp256k1::rand;
+use miniscript::bitcoin::Network;
 use miniscript::descriptor::DescriptorType;
 use miniscript::policy::Concrete;
 use miniscript::{translate_hash_fail, Descriptor, Miniscript, Tap, TranslatePk, Translator};

examples/verify_tx.rs

@@ -4,9 +4,9 @@
 
 use std::str::FromStr;
 
-use bitcoin::consensus::Decodable;
-use bitcoin::secp256k1::{self, Secp256k1};
-use bitcoin::{absolute, sighash, Sequence};
+use miniscript::bitcoin::consensus::Decodable;
+use miniscript::bitcoin::secp256k1::{self, Secp256k1};
+use miniscript::bitcoin::{absolute, sighash, Sequence};
 use miniscript::interpreter::KeySigPair;
 
 fn main() {