DXF: add the support of AutoCAD Wipeout object

[Jwohnlf]

Feature description

I open this issue with the intention to add an feature enhancement to add the support of WIPEOUT DXF entities. As mentionned in the knonw issue log, this feature is still missing in the DXF driver.

WIPEOUT objects are sometimes used to draw the outline of object. In the screenshot below a annotation box related to a sewer manhole is drawn as a block using such DXF entity.

Another example where a manhole outline is drawn with a Wipeout entity

Additional context

No response

[rouault]

FYI @atlight

[atlight]

Actually making the WIPEOUT entity perform the wipeout action on other geometries may be beyond the scope of the GDAL DXF driver, but it surely wouldn't be too difficult to construct the outline of the WIPEOUT as a polygon so that the consumer can do what it wants with the raw geometry.

In any event I have little or no bandwidth for coding feature requests on the DXF driver at this time. I'd be happy to review pull requests though.

[Jwohnlf]

My intention is indeed to propose a feature implementation limited to the output the outline of these WIPEOUT entities. I'll do a pull request soon. Your review is obviously welcome !