[3.1] Updated ricardians

[vladtr]

Change Description

Deployment Changes

• Deployment Changes

API Changes

• API Changes

Documentation Additions

• Documentation Additions

[DenisCarriere]

👍 both Ricardian contracts are included:

• EOS User Agreement (EUA)
• EOS 42 regproducer update

[DenisCarriere]

Having issues building the ABI's using the following:

$ git checkout update-ricardians
$ cdt-cpp --version
cdt-cpp version 3.0.0-rc1
$ ./build.sh
...
Warning, action <regproducer> does not have a ricardian contract

$ cat build/contracts/eosio.system/eosio.system.abi

{
    "actions": [
        {
            "name": "regproducer",
            "type": "regproducer",
            "ricardian_contract": ""
        },
        ...
    ],
    ...
    "ricardian_clauses": [],
    "variants": [
        {
            "name": "variant_block_signing_authority_v0",
            "types": ["block_signing_authority_v0"]
        }
    ],
    "action_results": []
}