Currently we only get `std::io::Write` impls when the `bitcoin-io`
dependency is used. This is overly restrictive, it would be nice to have
`std::io::Write` imlps even without the `bitcoin-io` dependency.
Copy the logic out of the `bitcoin_io::impl_write` macro into `hashes`
but feature gate it differently.
Call the new macro inside `hash_type` (and in `hmac`), remove the
`impls` module, and move the tests to the integration test directory.
Remove the `io` feature from `hashes`, now if users enable `std` they
get `std::io::Write` impls and if they enable `bitcoin-io` they get
`bitcoin_io::Write` impls as well.
As we did for the wasm job.
In preparation for using the `run_task` script from maintainer tools we
want to have all the things that are particular to `rust-bitcoin` out of
the current `run_task` script.
The address/memory sanitizer test is specific to `hashes`. Add a script
in `hashes/contrib` and call it from the ASAN job.
No test coverage change.
Tobin C. Harding