Port feature 'make overhangs printable' from Orca Slicer #14944
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This PR ports the "Make Overhangs Printable" feature from Orca Slicer. The idea behind this feature is to add material to otherwise-unprintable overhangs so they can be printed without supports. It’s an invasive operation since it actually modifies the original model geometry.
The feature was first implemented in Cura and later ported into Orca Slicer. The original discussion and some examples can be found here: Orca Slicer Issue
This PR closes #11964, which previously had a port attempt in 2023: #11967. That PR was closed without providing a rational. The issue described still exists today. However, I think the benefit of implementing the feature outweigh the described issue. It describes that in a complex model a not printable overhang gets modified and is not printable afterwards as well. In a lot of other cases and models this feature makes the difference for easy printability without supports.