Add updater thread + Updater related functions (#253)

* first attempt at adding updater thread

* rustfmt

* rustfmt

* many lifetimes made static to allow api to spawn separate thread

* add first pass at updater thread functionality

* rustfmt

* add mpsc for returning status from update functions

* rustfmt

* add stop state, ensure update is triggered by wallet functions when wallet updater is running

* rustfmt

* add update status function to owner API, V3 owner api functions

* rustfmt

* change update warning

* adding tests for new updater control functions

* documentation updates

* rustfmt

impls/src/backends/lmdb.rs

@@ -362,7 +362,7 @@ where
 			.join(filename);
 		let path_buf = Path::new(&path).to_path_buf();
 		let mut stored_tx = File::create(path_buf)?;
-		let tx_hex = util::to_hex(ser::ser_vec(tx, ser::ProtocolVersion(1)).unwrap());;
+		let tx_hex = util::to_hex(ser::ser_vec(tx, ser::ProtocolVersion(1)).unwrap());
 		stored_tx.write_all(&tx_hex.as_bytes())?;
 		stored_tx.sync_all()?;
 		Ok(())

impls/src/test_framework/mod.rs

@@ -244,7 +244,7 @@ where
 	K: keychain::Keychain + 'a,
 {
 	let (wallet_refreshed, wallet_info) =
-		owner::retrieve_summary_info(wallet, keychain_mask, true, 1)?;
+		owner::retrieve_summary_info(wallet, keychain_mask, &None, true, 1)?;
 	assert!(wallet_refreshed);
 	Ok(wallet_info)
 }