New features

Initial DEV release.

Notable changes since beta1:

- Renamed getOptionsetOptions() to getOptionsetsByGroupOptions().

Notable changes since beta1:

- Added isset check to Slick::getOptions().

Notable changes since beta1:

- Added back deprecated functions to anticipate potential issues.
- Added isset check to Slick::getOptions().

Notable changes since beta1:
Be sure to clear cache, or drush cr, or trigger run /update.php due to a new service argument added at #3026252.

Notable changes since beta1:

Blazy 7.x-1.0-dev, 2019-03-12
-----------------------------
- Changed image item to be optional to reduce barriers to the API, the only required is URI.
- Fixed for attributes insanity.