Update the `ledger_validators` call to:
* Return more JSON-native datatypes, especially integers and floats,
  where possible.
* Always include an `address` element
* Optionally include a `name` element and `nonce` element if
  the `verbose` parameter is set.

This output is slightly different than the previous version, which
would return the validator address in `validator_address`, and even
then, only if `verbose` had been set.

I believe that `address` is a critical identity property to the
validator, not an optional one. Human-readable angry-purple-tiger
name, on the other hand, is optional instead.

Fix the `ledger_validators` method so that the return type of the "name"
attribute for a validator appears properly in the JSON results as a
string instead of a list of integers.

Also add the validator's address to the result set, since that is
an important identifier to have.

Fixes helium/miner#908.

Fix several points in the JSON/RPC interface where items which
should be strings in JSON are instead appearing as lists of integers
in result sets.

Likewise, fix an issue in the opposite direction, for `get_account`,
where the account address wasn't being B58 decoded before being
handed off to the ledger for querying.

Remove the "verbose" option from the ledger_validators call and make the
items it returns (nonce and name) part of the normal result set.

- core#917

- core#915

- core#914
- core#918

Start next round early if node does not have its proposal in

fix #893 - jsonrpc p2p_status jsx encoding error

Audit 74

Update core and add new snap-920076

If a node does not get its proposal into a round have it start the next
round early to get a jump on things. This should help with cases where
the node is behind and, because it has to validate all the blocks it
didn't sign, can't catch up for the whole epoch.

Audit 73, light gws

Remove pbc from lockfile

Do not expose the JSONRPC and GRPC ports on the miner docker files

- core#910: lazy snapshot field de-serialization

Put all gateways into non-validating mode

Bump to new snap-913684 for miner, exclude validators

Bump deps

- core: eager gossip plausible blocks
- libp2p: random peer predicate

add random peer predicate

Add audit-72, num_consensus_members=40