Continuous extrusion infill

I have made a set of features which together make it possible for any infill type to consist of a single connected line for each patch of infill.

Today it was merged, so it will be part of the next Cura release.

Before the features:

After the features:

See the original pull requests: infill outline count, connect infill polygons, multiply infill, and The combination of the last two

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