Implement Cobra CLI tooling, Viper config tooling (#336)

* start pulling out + replacing urfave and config

* replace many many instances of config

* move more stuff => viper

* properly remove urfave

* move some flags to root command

* add testrig commands to root

* alias config file keys

* start adding cli parsing tests

* reorder viper init

* remove config path alias

* fmt

* change config file keys to non-nested

* we're more or less in business now

* tidy up the common func

* go fmt

* get tests passing again

* add note about the cliparsing tests

* reorganize

* update docs with changes

* structure cmd dir better

* rename + move some files around

* fix dangling comma

vendor/github.com/spf13/cobra/README.md

@@ -0,0 +1,125 @@
+![cobra logo](https://cloud.githubusercontent.com/assets/173412/10886352/ad566232-814f-11e5-9cd0-aa101788c117.png)
+
+Cobra is both a library for creating powerful modern CLI applications as well as a program to generate applications and command files.
+
+Cobra is used in many Go projects such as [Kubernetes](http://kubernetes.io/),
+[Hugo](https://gohugo.io), and [Github CLI](https://github.com/cli/cli) to
+name a few. [This list](./projects_using_cobra.md) contains a more extensive list of projects using Cobra.
+
+[![](https://img.shields.io/github/workflow/status/spf13/cobra/Test?longCache=tru&label=Test&logo=github%20actions&logoColor=fff)](https://github.com/spf13/cobra/actions?query=workflow%3ATest)
+[![GoDoc](https://godoc.org/github.com/spf13/cobra?status.svg)](https://godoc.org/github.com/spf13/cobra)
+[![Go Report Card](https://goreportcard.com/badge/github.com/spf13/cobra)](https://goreportcard.com/report/github.com/spf13/cobra)
+[![Slack](https://img.shields.io/badge/Slack-cobra-brightgreen)](https://gophers.slack.com/archives/CD3LP1199)
+
+# Table of Contents
+
+- [Overview](#overview)
+- [Concepts](#concepts)
+  * [Commands](#commands)
+  * [Flags](#flags)
+- [Installing](#installing)
+- [Usage](#usage)
+  * [Using the Cobra Generator](user_guide.md#using-the-cobra-generator)
+  * [Using the Cobra Library](user_guide.md#using-the-cobra-library)
+  * [Working with Flags](user_guide.md#working-with-flags)
+  * [Positional and Custom Arguments](user_guide.md#positional-and-custom-arguments)
+  * [Example](user_guide.md#example)
+  * [Help Command](user_guide.md#help-command)
+  * [Usage Message](user_guide.md#usage-message)
+  * [PreRun and PostRun Hooks](user_guide.md#prerun-and-postrun-hooks)
+  * [Suggestions when "unknown command" happens](user_guide.md#suggestions-when-unknown-command-happens)
+  * [Generating documentation for your command](user_guide.md#generating-documentation-for-your-command)
+  * [Generating shell completions](user_guide.md#generating-shell-completions)
+- [Contributing](CONTRIBUTING.md)
+- [License](#license)
+
+# Overview
+
+Cobra is a library providing a simple interface to create powerful modern CLI
+interfaces similar to git & go tools.
+
+Cobra is also an application that will generate your application scaffolding to rapidly
+develop a Cobra-based application.
+
+Cobra provides:
+* Easy subcommand-based CLIs: `app server`, `app fetch`, etc.
+* Fully POSIX-compliant flags (including short & long versions)
+* Nested subcommands
+* Global, local and cascading flags
+* Easy generation of applications & commands with `cobra init appname` & `cobra add cmdname`
+* Intelligent suggestions (`app srver`... did you mean `app server`?)
+* Automatic help generation for commands and flags
+* Automatic help flag recognition of `-h`, `--help`, etc.
+* Automatically generated shell autocomplete for your application (bash, zsh, fish, powershell)
+* Automatically generated man pages for your application
+* Command aliases so you can change things without breaking them
+* The flexibility to define your own help, usage, etc.
+* Optional tight integration with [viper](http://github.com/spf13/viper) for 12-factor apps
+
+# Concepts
+
+Cobra is built on a structure of commands, arguments & flags.
+
+**Commands** represent actions, **Args** are things and **Flags** are modifiers for those actions.
+
+The best applications read like sentences when used, and as a result, users
+intuitively know how to interact with them.
+
+The pattern to follow is
+`APPNAME VERB NOUN --ADJECTIVE.`
+    or
+`APPNAME COMMAND ARG --FLAG`
+
+A few good real world examples may better illustrate this point.
+
+In the following example, 'server' is a command, and 'port' is a flag:
+
+    hugo server --port=1313
+
+In this command we are telling Git to clone the url bare.
+
+    git clone URL --bare
+
+## Commands
+
+Command is the central point of the application. Each interaction that
+the application supports will be contained in a Command. A command can
+have children commands and optionally run an action.
+
+In the example above, 'server' is the command.
+
+[More about cobra.Command](https://godoc.org/github.com/spf13/cobra#Command)
+
+## Flags
+
+A flag is a way to modify the behavior of a command. Cobra supports
+fully POSIX-compliant flags as well as the Go [flag package](https://golang.org/pkg/flag/).
+A Cobra command can define flags that persist through to children commands
+and flags that are only available to that command.
+
+In the example above, 'port' is the flag.
+
+Flag functionality is provided by the [pflag
+library](https://github.com/spf13/pflag), a fork of the flag standard library
+which maintains the same interface while adding POSIX compliance.
+
+# Installing
+Using Cobra is easy. First, use `go get` to install the latest version
+of the library. This command will install the `cobra` generator executable
+along with the library and its dependencies:
+
+    go get -u github.com/spf13/cobra
+
+Next, include Cobra in your application:
+
+```go
+import "github.com/spf13/cobra"
+```
+
+# Usage
+
+See [User Guide](user_guide.md).
+
+# License
+
+Cobra is released under the Apache 2.0 license. See [LICENSE.txt](https://github.com/spf13/cobra/blob/master/LICENSE.txt)