Implement new API for sign_and_submit_then_watch (#354)

* WIP Implementing new event subscription API

* back to lifetimes, fix example

* no more need for accept_weak_inclusion

* thread lifetime through to prevent 'temporary dropped' issue

* make working with events a little nicer

* Get tests compiling

* fmt and clippy

* _name back to name

* dont take ownership, just have stronger note

* Attempt to fix test

* remove commented-out code

* Add a couple more helper methods and a test

* Remove custom ExtrinsicFailed handling; treat them like other events

* Handle runtime errors in TransactionProgress related bits

* cargo fmt + clippy

* Fix some of the failing tests

* remove unused import

* fix transfer_error test

* Fix compile errors against new substrate latest

* Comment tweaks, and force test-runtime rebuild

* Drop the TransactionProgress subscription when we hit 'end' statuses

* cargo fmt

* find_event to find_first_event and helper to return all matching events

* TransactionProgressStatus to TransactionStatus

* Copy and improve docs on TransactionStatus from substrate

* debug impl for Client to avoid manual debug impls elsewhere

* Add and tweak comments, specifically a note about block inclusion on errors

* clippy + fmt

* Fix docs

* Ignore 'error' statuses and adhere to the substrate docs

* tweak and improve some comments per @dvdplm's suggestions

* Break transaction* structs into separate file

* fmt and fix doc link

src/lib.rs

@@ -67,6 +67,7 @@ mod metadata;
 pub mod rpc;
 pub mod storage;
 mod subscription;
+mod transaction;
 
 pub use crate::{
     client::{
@@ -83,6 +84,7 @@ pub use crate::{
         Error,
         PalletError,
         RuntimeError,
+        TransactionError,
     },
     events::{
         EventsDecoder,
@@ -102,7 +104,6 @@ pub use crate::{
     },
     rpc::{
         BlockNumber,
-        ExtrinsicSuccess,
         ReadProof,
         RpcClient,
         SystemProperties,
@@ -118,6 +119,11 @@ pub use crate::{
         EventSubscription,
         FinalizedEventStorageSubscription,
     },
+    transaction::{
+        TransactionInBlock,
+        TransactionProgress,
+        TransactionStatus,
+    },
 };
 
 /// Call trait.