Refactor baseline compiler

[puerco]

This PR refactors the baseline compiler code to separate the cli from the generation/loading logic. This allows us to extend the cli to support more use cases and makes the loader and generator easier to use.

In summary, this PR:

• Introduces new baseline.Loader and baseline.Generator objects that house the existing logic.
• Moves the CLI code into an internal package
• Creates an independent types package with the yaml data structures

The CLI itself has the same interface as before:

Baseline Compiler reads the Basline YAML and outputs it as a markdown document.

Usage:
  baseline-compiler [flags]
  baseline-compiler [command]

Available Commands:
  compile     Compile a YAML file of security criteria
  completion  Generate the autocompletion script for the specified shell
  help        Help about any command

Flags:
  -h, --help   help for baseline-compiler

Use "baseline-compiler [command] --help" for more information about a command.
[puerco@babieco security-baseline/cmd] on  refactor-compiler 🦆❯ go run . compile --help
Compile a YAML file of security criteria

Usage:
  baseline-compiler compile [file] [flags]

Flags:
  -b, --baseline string   path to directory containing the baseline YAML data (default "../baseline")
  -h, --help              help for compile
  -o, --output string     path to output file (defaults to STDOUT)
  -t, --template string   path to the markdown template file (default "template.md")

I'll follow up with PR with a validation command.

Signed-off-by: Adolfo García Veytia (Puerco) adolfo.garcia@uservers.net

[puerco]

OK, fixed the merge conflict we discussed in the feb 18th meeting, PTAL

[funnelfiasco]

LGTM. I ran it through some general usage and everything worked as expected.