The purpose of this is to make it easier to maintain and eventually to
allow the rclone backends to be re-used in other projects without
having to use the rclone configuration system.
The new code layout is documented in CONTRIBUTING.
Previously config sub commands were manually parsed rather than using
cobra.
Make config command have the following sub commands:
* create Create a new remote with name, type and options.
* delete Delete an existing remote <name>.
* dump Dump the config file as JSON.
* edit Enter an interactive configuration session.
* file Show path of configuration file in use.
* providers List in JSON format all the providers and options.
* show Print (decrypted) config file, or the config for a single remote.
* update Update options in an existing remote.
The following changes were made to existing commands
* listproviders was renamed to providers
* listoptions was removed in favour of providing the output in providers
* jsonconfig was renamed to create
* an optional parameter was added to the show command
