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Automatic loading of properties stored in files without having to manually create the property before reading.

See merge request !302

Fix calc centroid

Closes #78

See merge request !303

add test that checks if a property of type std::vector<T> with T not having a default constructor can be cerated

Range starts

See merge request !301

make it so that CCW iter ranges are the reverse of CW iter ranges, i.e. they do not start with the same element anymore