Enable ytt integration

[mdaugs]

ytt is already part of the docker image.
But it is not used in the project.

Describe the solution you'd like
It would be great to optionally use ytt for extended forms parsing.

This would enable templating as:

# forms.yaml
#@ load("@ytt:data", "data")
---
categories:
  - name: Default
    icon: bars
roles:
  - name: admin
    groups:
      - local/admins
constants:
  data_values: #@ data.values
forms:
  - name: Demo Form
    type: ansible
    inventory: #@ data.values.INVENTORY_PATH
    playbook: dummy.yml
fields:
  - name: var_host_name
    type: text
    label: Hostname
    default: Object($(data_values)).default_host
    eval_default: true

Where data is provided by either a file or environment variables.

[ansibleguy76]

Hi, ytt was added on request once. I know it's to build dynamic yaml files, but don't know if it just integrates or not.
Let me check your PR.

[ansibleguy76]

integrated into new beta.
please PR to devel branch