Rename ScriptType to KeychainKind

This avoids confusion with the "type of script".

examples/address_validator.rs

@@ -28,7 +28,7 @@ use bdk::bitcoin;
 use bdk::database::MemoryDatabase;
 use bdk::descriptor::HDKeyPaths;
 use bdk::wallet::address_validator::{AddressValidator, AddressValidatorError};
-use bdk::ScriptType;
+use bdk::KeychainKind;
 use bdk::{OfflineWallet, Wallet};
 
 use bitcoin::hashes::hex::FromHex;
@@ -39,7 +39,7 @@ struct DummyValidator;
 impl AddressValidator for DummyValidator {
     fn validate(
         &self,
-        script_type: ScriptType,
+        keychain: KeychainKind,
         hd_keypaths: &HDKeyPaths,
         script: &Script,
     ) -> Result<(), AddressValidatorError> {
@@ -50,7 +50,7 @@ impl AddressValidator for DummyValidator {
 
         println!(
             "Validating `{:?}` {} address, script: {}",
-            script_type, path, script
+            keychain, path, script
         );
 
         Ok(())

examples/compiler.rs

@@ -40,7 +40,7 @@ use miniscript::policy::Concrete;
 use miniscript::Descriptor;
 
 use bdk::database::memory::MemoryDatabase;
-use bdk::{OfflineWallet, ScriptType, Wallet};
+use bdk::{KeychainKind, OfflineWallet, Wallet};
 
 fn main() {
     env_logger::init_from_env(
@@ -104,7 +104,7 @@ fn main() {
     info!("... First address: {}", wallet.get_new_address().unwrap());
 
     if matches.is_present("parsed_policy") {
-        let spending_policy = wallet.policies(ScriptType::External).unwrap();
+        let spending_policy = wallet.policies(KeychainKind::External).unwrap();
         info!(
             "... Spending policy:\n{}",
             serde_json::to_string_pretty(&spending_policy).unwrap()