Remove all (non-dev) client references from frame, activate dependency enforcer (#4184)

* Move transaction pool to primitives

* move backend, errors into primitives

* remove unused client depencies

* Move rpc-api into primitives

* Move peerset back to client

* Move rpc/api back to client, move palette/support/rpc into utils

* move support-rpc into subfolder

* move system-rpc into utils

* move transaction-pool  and -graph back into client

* fix broken imports

* Clean up test primitives

* Make support test utils independent of frame

* remove unnecessary node dependencies from service

* Reactivate dependency script:
 - only enforce the now achieved status quo will remain
 - allow for primitives to depend on /client for now without failing
 - more discriptive error message so people understand, what it wants
 - minor fix to differentiative between ../client and /client (which may be a subfolder)
 - don't allow this to fail anylonger.

* fix doc comment

* 'Should not' rather than 'must not'.

* Revert unwanted dependency changes

* fix faulty import

* fixup derive_more version

* fix wrong import path

substrate/client/rpc/src/state/state_light.rs

@@ -40,9 +40,9 @@ use rpc::{
 
 use api::Subscriptions;
 use client_api::backend::Backend;
+use sp_blockchain::Error as ClientError;
 use client::{
-	BlockchainEvents, Client, CallExecutor, 
-	error::Error as ClientError,
+	BlockchainEvents, Client, CallExecutor,
 	light::{
 		blockchain::{future_header, RemoteBlockchain},
 		fetcher::{Fetcher, RemoteCallRequest, RemoteReadRequest, RemoteReadChildRequest},