cli overhaul (#1600)

* cli commands

* cleanup parity/signer

* cleanup parity/signer

* remove redundant import of signer crate from main.rs

* cli cleanup in progress

* cli cleanup in progress

* moved few commonly used functions to separate methods with tests

* cleaning up blockchain import in progress

* cleaning up blockchain import in progress2

* cleaning up blockchain import in progress3

* tests for database compaction profile parsing

* cleaning up blockchain import in progress4

* cleaning up blockchain import in progress5

* blockchain import

* export blockchain in progress

* cleanup execute_export

* Configuration::to_duration cleaned up

* removed unused code, tests for to_duration

* cleanup Configuration::mode function

* parsing some of the cli params in params.rs

* rpc and signer are no longer optional

* move importing extern crates to main.rs file

* swipe dies from rpc module

* swipe dies from dapps

* finding deprecated

* several tests and fixes for parity

* parity cleanup in progress

* cleanup price parsing

* parity cleanup in progress

* swiped all dies

* parity cleanup in progress

* replace usages of from_str with parse() in parity/params.rs

* removed few more from_str

* split parity/params.rs into params and helpers

* removed wildcard import from configuration.rs

* cleanup directories/path creation

* cleaning up run cmd

* moved LoggerConfig

* defaults for cli params

* fixed indention in raise_fd_limit

* tests for rpc_apis

* tests for default ipc and rpc settings

* ipc socket

* cleanup in progress

* account service

* cleanup miner config

* BlockChain commands use Directiores structure now

* client_config

* network settings and dapps configuration

* removing warnings

* default logger config

* fixed client_path

* overhaul

* fixing export && import

* default export DataFormat

* import and export also upgrade db

* fixed export && import

* polishing pr

* polishing pr

* fixed custom bootnodes

* fixed daemonize on windows

* fixed setting up enable network

* finished pr

* fixed compiling on windows

* Fixed warning; windows build

* Better cache management

* Fixed tests on windows

* Fixed test

* Restored pruning method names

* --cache alias

* Fixed more tests

* Ensure default options actually listed as valid

[ci:skip]