Parse a Tiled group layer and create a state object for inheriting.
| name | type | arguments | description |
|---|---|---|---|
| json | object |
The Tiled JSON object. |
|
| group | object | <optional> |
The current group layer from the Tiled JSON file. |
| parentState | object | <optional> |
The state of the parent group (if any). |
A group state object with proper values for updating children layers.