Dev Random

OK, I did find one incompatibility, in the construction of `Error` - and I think it's fixed now. Added the binary that I used to test.

OK, good points. I pushed a commit that changes the approach - the no-std io module is now always exported. However, this is still non-additive, because `Serializer` uses different `Write`...

Source is still needed, otherwise it cannot be considered safe to run in production.

> Binance-chain seems to be a copy of Cosmos, you can grab it here https://github.com/cosmos/gaia/tree/porting Binance forked and modified the code a while ago, so using Cosmos will not be...

one more idea. it would be nice to collect all the tests of a file into a static array. this would require one of the following to automatically collect the...

> * using the `inventory` or `linkme` crates as a dev dependency I pushed a proposal

note that I didn't yet go over all the functional tests in the codebase and ensure they have the `xtest` macro. let me know if you want this right off.

~~so I am seeing spurious `BroadcastChannelAnnouncement` messages causing functional tests failures when running the externalized tests. I think this might be an existing heisenbug, which is triggered here because of...

I am making `delegate` optional for non-dev builds. is this what you wanted, or did you also want it to be optional for dev?

this is ready for final review