Make bdk and bdk_chain work under 1.57.0

- rewrite some parts of the code to deal with older borrow checker
- downgraded hashbrown

example-crates/keychain_tracker_example_cli/Cargo.toml

@@ -10,7 +10,7 @@ bdk_file_store = { path = "../../crates/file_store" }
 bdk_tmp_plan = { path = "../../nursery/tmp_plan" }
 bdk_coin_select = { path = "../../nursery/coin_select" }
 
-clap = { version = "4", features = ["derive", "env"] }
+clap = { version = "3.2.23", features = ["derive", "env"] }
 anyhow = "1"
 serde = { version = "1", features = ["derive"] }
 serde_json = { version = "^1.0" }

example-crates/keychain_tracker_example_cli/src/lib.rs

@@ -675,7 +675,7 @@ pub fn planned_utxos<'a, AK: bdk_tmp_plan::CanDerive + Clone, P: ChainPosition>(
 ) -> impl Iterator<Item = (bdk_tmp_plan::Plan<AK>, FullTxOut<P>)> + 'a {
     tracker
         .full_utxos()
-        .filter_map(|((keychain, derivation_index), full_txout)| {
+        .filter_map(move |((keychain, derivation_index), full_txout)| {
             Some((
                 bdk_tmp_plan::plan_satisfaction(
                     &tracker