Stellarium / stellarium / 5685622886

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Always use texture-based text rendering in StelPainter

This will let us control gamma correction by editing a shader when we
convert our rendering pipeline to linear colors. We can't do this when
using QOpenGLPaintDevice.

Text rendering quality doesn't change. From my observations via
apitrace, QOpenGLPaintDevice does basically the same, even for rotated
text: just renders textured quads with the texture containing text.

5 of 5 new or added lines in 1 file covered. (100.0%)

14813 of 124480 relevant lines covered (11.9%)

24698.25 hits per line