No more unwanted infill, please

Note: The stable version is the 2.3.56.9, below.

bugfixes

• Fix for no_perimeter_unsupported_algo #1621 (and renamed to be a bit better worded)
• Fix crash from perimeter_loop #1623
• Fix crash (fix filament override for coFloatOrPercent / coFloatsOrPercents) #1618
• Fix a clipper bug when a line in a polyline is horizontal. #1624
• Fix bad check for default_acceleration when disabled and exporting config. #1622
• Allow to set the top fill for spiral vase

note: I haven't tested the linux & macos build.
You can have daily builds in the action menu of github.
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