Stellarium / stellarium / 6371611869

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Make objects split by cylinder projections wraparound appear on one side of the screen

Some projections expand azimuth dimension over the width of the screen.
This makes objects that are clipped by a side of the screen appear on
the other side. But currently these objects remain single objects, which
results in stretching over the whole distance between one side of the
projection to the other.

This commit improves on this situation by making it possible to put an
object completely on one side of the screen — the one where object's
center resides. This loses the second half that should appear on the
opposite side of the screen, but at least avoids the stretching
artifacts.

Currently this is only applied to Cylinder projection and its
derivatives. Others may be tweaked similarly in subsequent commits.

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