Stellarium / stellarium / 15752957228

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Fix z fighting of HiPS levels (#4376)

When a tile is drawn in a planetary survey, and then its child of a
higher level is drawn over, we can often observe the lower-level tile
shining through the higher-level one, and the shape that shines through
depends on the position of the planet, which resembles z fighting.

To combat this, we now draw only the deepest HiPS level requested for
the current zoom level, substituting lower-resolution textures for the
tiles whose native-resolution textures haven't been loaded yet.

This makes it much harder to support fading between levels, so fading
support is removed.

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14700 of 124867 relevant lines covered (11.77%)

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