When a header that finalizes a chain of headers is succesfully imported
we also want to mark its ancestors as finalized.

There's no guarantee that the consensus digest item will be the last
one in a header, which is how it was previously being checked.

Thanks to Andre for pointing me to the Grandpa code that does this.

Fixes a problem with how the scheduled change was counted as well as
a SCALE encoding issue

I've been struggling with getting the generic types between the storage and verifier
traits to play nice with each other. As a way to continue making progress I'm moving
everything to the pallet. This way I hope to make progress towards a functional
pallet.

* Use images from DockerHub for Substrate nodes and relay

* Use OpenEthereum image from Docker Hub

* Pull latest images from Docker Hub during updates

* Add Docker Compose override for building from Git

* Pin Prometheus and Grafana Docker containers

* Support updates via Git or Docker in update script

* Add override instructions to deployment README

* Use Git or Docker based on a .env config

* Update deployment instructions to cover .env files

* Define healthcheck URL during build process

* Use include statments in healthcheck matrix

* fix (workaround) for NaN CPU usage

* cargo fmt --all

* changed log level from error to trace

* incomplete during submit != synced

* Add header-chain primitive crate

* Make MinimalHeaderChain functionaly the same as PeerBlockchain

* Use a better doc comment for MinimalHeaderChain

* Fix benchmark compilation

* Rust Fmt

* Remove Substrate based dependencies

* Rename MinimalHeaderChain to BaseHeaderChain

* parse all deploy contract arguments

* cargo fmt --all

* Update open ethereum.

* Remove extra line break.

* Remove branch comment.

* update jsonrpsee reference

* update CPU-related widgets

* Update rustup.

* Allow updating multiple things at once.