Make subxt-core ready for publishing (#1508)

* Move Extrinsic decoding things to subxt_core and various tidy-ups

* A couple more fixes and fmt

* first pass moving tx logic to subxt_core

* cargo fmt

* fix wasm example

* clippy

* more clippy

* WIP Adding examples and such

* Move storage functionality more fully to subxt_core and nice examples for storage and txs

* Add example for events

* consistify how addresses/payloads are exposed in subxt-core and add runtime API fns

* Add runtime API core example

* fmt

* remove scale-info patch

* Add a little to the top level docs

* swap args around

* clippy

* cargo fmt and fix wasm-example

* doc fixes

* no-std-ise new subxt-core additions

* alloc, not core

* more no-std fixes

* A couple more fixes

* Add back extrinsic decode test

subxt/examples/setup_config_custom.rs

@@ -62,7 +62,7 @@ impl<T: Config> ExtrinsicParams<T> for CustomExtrinsicParams<T> {
     // Gather together all of the params we will need to encode:
     fn new(client: &ClientState<T>, params: Self::Params) -> Result<Self, ExtrinsicParamsError> {
         Ok(Self {
-            genesis_hash: client.genesis_hash(),
+            genesis_hash: client.genesis_hash,
             tip: params.tip,
             foo: params.foo,
         })