Example of 3d point:
```
HEADER.INSBASE=(1.0 2.0 3.0)
```

There are another situations like:
```
PLIMMIN: (0.000000, 0.000000) [2RD 10]
PLIMMAX: (12.000000, 9.000000) [2RD 10]
```
where it's 2d point
Add support for dwgadd HEADER setting for point or multiple float values in variable
This is a GitHub Issue
repo:libredwg
owner:LibreDWG
Title : Add support for dwgadd HEADER setting for point or multiple float values in variable
Issue date:

--- start body ---
Example of 3d point:
```
HEADER.INSBASE=(1.0 2.0 3.0)
```

There are another situations like:
```
PLIMMIN: (0.000000, 0.000000) [2RD 10]
PLIMMAX: (12.000000, 9.000000) [2RD 10]
```
where it's 2d point
--- end body ---
