This unifies the 3 methods of reading config
* command line
* environment variable
* config file
And allows them all to be configured in all places. This is done by
making the []fs.Option in the backend registration be the master
source of what the backend options are.
The backend changes are:
* Use the new configmap.Mapper parameter
* Use configstruct to parse it into an Options struct
* Add all config to []fs.Option including defaults and help
* Remove all uses of pflag
* Remove all uses of config.FileGet
It is unnecessary to notify the node.Parents, because a cahnge event is
generated for all involved files and folders in a move from d1/f1 to
d2/f1. There will be a event for d1, d2 and f1.
Additionally a duplicate notification is resolved when them empty string
is in pathsToClear.
Related to #2006
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.
