* RPC `ledger` command returns all queue entries in "queue_data"
when requesting open ledger, and including boolean "queue: true".
* Includes queue state. e.g.: fee_level, retries, last_result, tx.
* Respects "expand" and "binary" parameters for the txs.
* Remove some unused code.
Add envconfig test helper for manipulating Env config via
callables. Create new common modifiers for non-admin config,
validator config and one for using different server port values.