Add ability to publish commands to devices via Meadow.Cloud

[stevenkuhn]

This adds the ability to publish commands to a collection of devices via Meadow.Cloud using Meadow.Cloud's new Command & Control publish command feature. The new command is meadow cloud command publish <COMMAND_NAME>. The generated help text for this new command is:

USAGE
  meadow cloud command publish <COMMAND_NAME> --collectionId <value> [options]

DESCRIPTION
  Publish a command to Meadow devices via the Meadow Service

PARAMETERS
* COMMAND_NAME      The name of the command

OPTIONS
* -c|--collectionId  The target collection for publishing the command
  -a|--args         The arguments for the command as a JSON string
  -q|--qos          The MQTT-defined quality of service for the command Choices: "AtLeastOnce", "AtMostOnce", "ExactlyOnce". Default: "AtLeastOnce".
  --host            Optionally set a host (default is https://www.meadowcloud.co)
  -h|--help         Shows help text.

For this initial version, meadow cloud command publish requires a collectionId which is the collection of Meadow devices that this command will sent. A future update will allow a list of device ids as an additional option.

Example

An example of this command would be:

C:\>meadow login
Signed in as [email protected]
Done!

C:\>meadow cloud command publish TurnOnWater -c example_collection_id -a "{""durationInMinutes"":15}"
Publishing 'TurnOnWater ' command to Meadow.Cloud. Please wait...
Publish command successful.
Done!

If the included arguments are not properly formatted (quotes need to be escaped), a JSON error will occur:

C:\>meadow cloud command publish TurnOnWater -c example_collection_id -a "{"duration":15}"
Provided arguments is not valid JSON: 'd' is an invalid start of a property name. Expected a '"'. LineNumber: 0 | BytePositionInLine: 1.
Done!

Subcommand Changes

This change also bundles up the meadow cloud commands into a single command:

USAGE
  meadow [options]
  meadow [command] [...]

OPTIONS
  -h|--help         Shows help text.
  --version         Shows version information.

COMMANDS
  app deploy        Deploy the specified app to the Meadow
  cloud             Provides Meadow.Cloud service related commands. Subcommands: cloud command, cloud login, cloud logout.
  collection list   List Meadow Collections
  debug             Debug a Meadow Application
  ...more...

Each subcommand under meadow cloud then has its own help file.

meadow cloud --help

USAGE
  meadow cloud [options]
  meadow cloud [command] [...]

DESCRIPTION
  Provides Meadow.Cloud service related commands.

OPTIONS
  -h|--help         Shows help text.

COMMANDS
  command           Provides command & control related commands for devices. Subcommands: command publish.
  login             Log into the Meadow Service
  logout            Logout of the Meadow Service

You can run `meadow cloud [command] --help` to show help on a specific command.
Done!

meadow cloud command --help

USAGE
  meadow cloud command [options]
  meadow cloud command [command] [...]

DESCRIPTION
  Provides command & control related commands for devices.

OPTIONS
  -h|--help         Shows help text.

COMMANDS
  publish           Publish a command to Meadow devices via the Meadow Service

You can run `meadow cloud command [command] --help` to show help on a specific command.
Done!

[lamebrain]

Looks good. One suggestion.