Subxt Guide (#890)

* WIP Starting to write book; extrinsics first pass done

* cargo fmt

* Ongoing work; events, constants, wip blocks

* at_latest() and wip blocks

* remove need to import parity-scale-codec crate with Subxt for macro to work

* More docs; expanding on setup guide and finish pass of main sections

* Tidy and remove example section for now

* format book lines to 100chars

* Fix example code

* cargo fmt

* cargo fmt

* fix example

* Fix typos

* fix broken doc links, pub mods

* Update Subxt macro docs

* can't link to Subxt here

* move macro docs to Subxt to make linking better and fix example code

* note on macro about docs

* cargo fmt

* document the no_default_derives macro feature

* Address feedback and remove redundant text

* address review comments; minor tweaks

* WIP add Runtime calls to book

* Improve Runtime API docs

* expose thing we forgot to expose and doc link fixes

subxt/src/blocks/mod.rs

@@ -7,5 +7,5 @@
 mod block_types;
 mod blocks_client;
 
-pub use block_types::{Block, Extrinsic, ExtrinsicEvents};
+pub use block_types::{Block, BlockBody, Extrinsic, ExtrinsicEvents};
 pub use blocks_client::{subscribe_to_block_headers_filling_in_gaps, BlocksClient};