There is issue in conversion from JSON to DWG.
Example:
[test.json.gz](https://github.com/LibreDWG/libredwg/files/11104873/test.json.gz)

When i convert this JSON file via:
```
dwgwrite test.json
```
there is error:
```
Warning: Unknown key HEADER.layer_colors
```
which means no conversion to DWG.

Main problem is with https://github.com/LibreDWG/libredwg/blob/master/src/in_json.c#L1076 which was not found item.

I don't understand what I need to fix. 
As I understand there is no match of ```layer_colors[128]``` and ```layer_colors```
layer_colors issue with conversion from JSON (AC1.40) to DWG (AC1.40)
This is a GitHub Issue
repo:libredwg
owner:LibreDWG
Title : layer_colors issue with conversion from JSON (AC1.40) to DWG (AC1.40)
Issue date:

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There is issue in conversion from JSON to DWG.
Example:
[test.json.gz](https://github.com/LibreDWG/libredwg/files/11104873/test.json.gz)

When i convert this JSON file via:
```
dwgwrite test.json
```
there is error:
```
Warning: Unknown key HEADER.layer_colors
```
which means no conversion to DWG.

Main problem is with https://github.com/LibreDWG/libredwg/blob/master/src/in_json.c#L1076 which was not found item.

I don't understand what I need to fix. 
As I understand there is no match of ```layer_colors[128]``` and ```layer_colors```
--- end body ---
