Errant warning in signers.scopes + signers.allowedcontracts should support specifying contract name

[RawichK]

Location: signers object in launch.json

"signers": [
  {
    "account": "@owner",
    "scopes": "CalledByEntry, CustomContracts",
    "allowedcontracts": ["0xd2a4cff31913016155e38e474a2c06d08be276cf"] // GAS contract hash
  }
]

The scopes can be specified as "CalledByEntry, CustomContracts" and works well but it shows a warning Value is not accepted. Valid values: "None", "CalledByEntry", "CustomContracts", "CustomGroups", "Global".(1)

The allowedcontracts accept only contract hash, but contract hash changes every time re-build / re-deploy, so #contractName notation should be added (the same format as invoke files).

[devhawk]

We already parse contract names elsewhere, so it's fairly straightforward to enable something like

"signers": [
  {
    "account": "@owner",
    "scopes": "CalledByEntry, CustomContracts",
    "allowedcontracts": ["GasToken"] 
  }
]

Also, the Value is not accepted warning can be safely ignored. The json schema for scopes property is wrong, but that doesn't affect the actual value parsing of the property by the debugger. But that should ALSO get fixed

[devhawk]

labeled bug and feature. warning is a bug, specifying allowed contract by name is a feature. But they are both small enough there's no point in splitting them into separate issues.