Track `master` instead of `polkadot-v0.9.9` (#84)

* Follow specific commits instead of `master` branch

* Update dependencies in Lockfile

* Add statemine runtime as reference

* Sort some imports

* Make deps follow `master` instead of revisions

* Add contracts related code to runtime

* RustFmt runtime

* Update `service.rs`

* Remove Statemine reference runtime

* RustFmt service

* Add `sudo` pallet back

Even though we're not using it we still need it
for the Polkadot test-runtime to compile

* Point to my custom Cumulus branch

This bumps Substrate, Polkadot, and BEEFY

* Bump Substrate et. al in Lockfile

* Fix compilation issues in `node`

* Switch Cumulus branch back to `master`

* Enable collator selection

Co-authored-by: Ricardo Rius <[email protected]>