Convert Node to Parachain (#73)

* Update runtime to match that of the `substrate-parachain-template`

* Update runtime TOML file to match that from `substrate-parachain-template`

* Add some fixes for `master` branch code

* Use patched dependencies for Substrate, Polkadot, and Cumulus

* Update runtime after downgrading Substrate deps

* Copy service file over from `substrate-parachain-template`

* Copy CLI file over from `substrate-parachain-template`

* Copy Command file over from `substrate-parachain-template`

Also updated some fields to point to the relevant `canvas-node`
resources.

* Copy ChainSpec file over from `substrate-parachain-template`

* Update ChainSpec file to be slightly more Canvas node specific

* Add lib file to node

* Get RPC extension file compiling

* Try adding RPC to Cumulus service

* Use opaque types in RPC

The reason that my code wouldn't compile was that there was a mismatch
in the `Block` type being used by the service and the RPC.

* Hook up contracts RPC

* Copy `rustfmt` config from `substrate-parachain-template`

* Format repo

* Remove old monetary units

* Address most remaining TODO items

* Add missing license header

* Change binary name back to `canvas`

* Use less sketchy Substrate branch name

* Remove default node feature

* Add path to binary section

* Use experimental Cargo resolver

* Revert Substrate branch change

I think this pulls in some updated dependencies
which breaks the build.

* Clean up contracts related imports in TOML file

* Set `pallet-contracts` state rent related params to zero

* Don't use unstable contract features by default

* Update Substrate dependencies in README

* Update Substrate branch name

* Update GitHub dependency references

This is for BEEFY, Polkadot, and Cumulus

* Update `ChainType` and chain names

* Update `contract-pallet` constants

Co-authored-by: Alexander Theißen <[email protected]>

* Remove `testnet-1.json` file

We'll be creating an updated config later on.

* Attach issue number to TODO comment

* Minor readme fix

* Remove outdated usage info

Co-authored-by: Alexander Theißen <[email protected]>
Co-authored-by: Michael Mueller <[email protected]>