Update substrate to latest master

[geigerzaehler]

This update requires the following changes

• In the client we match all invalid transaction statuses with one pattern.
• The account nonce is now retrieved via the frame_system::Account storage.
• The frame_system::Trait::Event associated type has now a type bound that is generic over Self. This requires us to explicitly state some type bounds.

[geigerzaehler]

The builds fail because we seem to generate invalid transactions for the end-to-end tests. This looks like quite the issue. We need to find out why the transaction is invalid. Unfortunately the RPC apis don’t provide enough error information I believe. We might need to have the node log information to determine the error. It’s most likely that the transactions are invalid because calling <UncheckedExtrinsic as Checkable>::check() fails. The place too look would be client/src/transaction.rs.

[NunoAlexandre]

any luck, @CodeSandwich?

[CodeSandwich]

We were able to find out that it's the node that is rejecting the transactions, it's sending Invalid message to the client. We've pinned down the exact commit in Substrate that introduces this behavior: paritytech/substrate@0c8e059. Now I'm trying to find out what exactly in this commit is offensive to create a fix or workaround.

[CodeSandwich]

The upgrade is finally fixed 🎉

DO NOT MERGE
It depends on a commit in a feature branch, please wait for it getting merged and upgrade to newest master to avoid depending on a squashed-away WIP commit: paritytech/substrate#5227

[CodeSandwich]

Ready to be merged!

[geigerzaehler]

LGTM