Implement runtime api client side directly in the runtime (#1094)

* Move `initialise_block` into `Core` trait as it is crucial calling the API functions

* Switch to first version of new runtime API implementation

* Fixes bug in tests

* Reenable asserts

* Directly use the `TestAPI` in the tests

* Start improving the api traits

:100644 100644 898aadc7 49217199 M	Cargo.lock
:100644 100644 61570436 465ed664 M	core/client/src/backend.rs
:100644 100644 5d0c886b 64d710fd M	core/client/src/block_builder.rs
:100644 100644 c447855e 5ecbe474 M	core/client/src/client.rs
:100644 100644 139cef13 f90dbf3d M	core/client/src/error.rs
:100644 100644 2800c503 3298e66a M	core/client/src/runtime_api.rs
:100644 100644 affa1c5c 809b08bc M	core/primitives/src/lib.rs
:100644 100644 2877dfa9 d5547413 M	core/sr-api/Cargo.toml
:100644 100644 9a49784d 6a625a03 M	core/sr-api/src/lib.rs
:100644 100644 7c28e1c7 a1a444a9 M	core/sr-primitives/src/traits.rs
:100644 100644 2e113ab6 dcc01a6d M	srml/metadata/Cargo.toml
:100644 100644 ea722a70 0809531a M	srml/metadata/src/lib.rs

* Refactoring

* Move `sr-api` into client and more refactoring

* Fixes tests

* Some documentation and cleanup

* Fixes compilation after rebase

* More refactoring and more documentation

* Makes `substrate-client` compilable on `wasm`

On `wasm` it basically just exports the runtime api stuff.

* Fixes grumbles

* Updates wasm files after rebasing the master

* Remove TODO comment

* Remove whitespaces

* Fixes after rebasing master

* Another rebase, another fix commit

substrate/core/test-runtime/wasm/Cargo.toml

@@ -9,7 +9,7 @@ hex-literal = { version = "0.1.0", optional = true }
 parity-codec = { version = "2.1", default-features = false }
 parity-codec-derive = { version = "2.1", default-features = false }
 substrate-primitives = { path = "../../primitives", default-features = false }
-sr-api = { path = "../../sr-api", default-features = false }
+substrate-client = { path = "../../client", default-features = false }
 sr-std = { path = "../../sr-std", default-features = false }
 sr-io = { path = "../../sr-io", default-features = false }
 sr-version = { path = "../../sr-version", default-features = false }
@@ -22,12 +22,12 @@ std = [
 	"log",
 	"hex-literal",
 	"parity-codec/std",
-	"sr-api/std",
 	"sr-std/std",
 	"sr-io/std",
 	"srml-support/std",
 	"sr-version/std",
 	"substrate-primitives/std",
+	"substrate-client/std",
 	"sr-primitives/std"
 ]