Make sp_core and sp_runtime dependencies optional, and bump to latest (#760)

* begin porting over traits; remove Config use of Hash

* port over the Header bits that we need

* sp_core_hashing where possible, move Verify to PairSigner, remove unused errors

* tidy up Config things and move related bits into one place

* fix codegen

* copy Era over

* move AccountId, Address, Signer to Signer trait and a pass over fixing examples

* impl MultiAddress, MultiSignature, AccountId32 and add back to Config (for decoding later)

* Copy over StorageKey, StorageData, StorageChangeSet

* subxt core compiling with no sp_core or sp_runtime

* Get examples compiling

* pass over fixing tests

* cargo fmt

* clippy tweaks and update polkadot.rs

* fix codegen docs

* port over special DigestItem encoding/decoding

* clippy and doc fixes

* cargo fmt and example fix

* more cargo fmt-ing...

* substrate-extra to substrate-compat

* cargo.toml comments

* simplify PairSigner trait bounds

* move RPC types to a separate file

* fix docs

* Add some tests for things and other PR feedback

* bump to latest sp deps

* avoid needing substrate-compat feature in a test

subxt/src/tx/tx_progress.rs

@@ -15,7 +15,7 @@ use crate::{
         TransactionError,
     },
     events::EventsClient,
-    rpc::{
+    rpc::types::{
         Subscription,
         SubstrateTxStatus,
     },
@@ -26,9 +26,6 @@ use futures::{
     Stream,
     StreamExt,
 };
-use sp_runtime::traits::Hash;
-
-pub use sp_runtime::traits::SignedExtension;
 
 /// This struct represents a subscription to the progress of some transaction.
 #[derive(Derivative)]
@@ -373,7 +370,8 @@ impl<T: Config, C: OnlineClientT<T>> TxInBlock<T, C> {
         let extrinsic_idx = block.block.extrinsics
             .iter()
             .position(|ext| {
-                let hash = T::Hashing::hash_of(&ext.0);
+                use crate::config::Hasher;
+                let hash = T::Hasher::hash_of(&ext.0);
                 hash == self.ext_hash
             })
             // If we successfully obtain the block hash we think contains our