Terrascript

**This release requires Terraform 0.12 or later.**
Added
* Almost complete rewrite to align it with Terraform 0.12 JSON syntax.
* Providers, resources and data sources are now accessible through single modules instead of
individual modules for each provider.
* The module ``terrascript.providers`` contains **all** providers, e.g. ``terrascript.providers.google``.
* The module ``terrascript.resources`` contains **all** resource, e.g. ``terrascript.resources.aws_instance``.
* The module ``terrascript.datasources`` contains **all** resource, e.g. ``terrascript.datasources.alicloud_images``.
* [Oracle Cloud Infrastructure Provider](https://www.terraform.io/docs/providers/oci/index.html) (issue 63)

Added
* Locals resouce (pull 71)
* null provider resouces (pull 69)
* aws_rds_cluster_endpoint (pull 60)
* aws_kms_grant resource (pull 61)
* aws_config_configuration_aggregator resource (pull 61)
* Added many resources (pull 67)
Updated
* Updated all terraform provider resources (pull 67)
* Updated DigitalOcean resources (pull 58)
Fixed
* Added missing escape quote to the result json dump (pull 57)
* Remove temp directory after validation (pull 64)
Removed
* Support for all Terraform versions prior to release 0.12.

Added
* vSphere data sources/resources (pull 52)
* Added new aws resources (pull 51)
* Update azurerm resource and the function `interpolated` (pull 53)
* Added support for update terrascript from another terrascript. Same behavior as dict().update (pull 37)
* Added new cloudflare resources and data (pull 54)
* Added tests for Terraform 0.11.8

Fixed
* Work-around for data/JSON bug (issue 3).
* Fixed `provisioner` (issue 32)
Added
* `Terrascript.add()` method (issue 33).
* Missing vSphere data sources and resources (issue 35).
Removed
* Dropped support for Terraform < 0.10.6 (issue 38).

Fixed
* Problem when using resource in a loop (issue 26)
Added
* Added `terrascript.Terrascript` class wich makes this release
incompatible with earlier ones.
* Allow multiple providers (issue 22)