BREAKING CHANGE: almost a rewrite so we expect some things to possibly be broken
- Added commands for querying s3 backend
- Added Terraform Enterprise support
- Added migrations from s3 backend to terraform enterprise
- Added commands for interacting with Terraform Enterprise
- Added auto-creation of Terraform Enterprise Projects for workspaces
- Improved documentation to cover changes
- Added integration tests
- Replaced environment variable lookup vars with environment variable referencing from within configuration files