Stellarium / stellarium / 5777103997

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Improve text rendering quality

After we switched to texture-based text rendering, colored text on
bright background like direction markers on atmosphere background got a
barely noticeable dark fringe.

Using alpha channel rendered by QPainter doesn't seem to be easy to get
right, so this commit instead uses the RGB channel of white text
rendered on black background to get intensity to modulate text color by.

The result is now closer to the one we got from QPainter over
QOpenGLPaintEngine.

47 of 47 new or added lines in 1 file covered. (100.0%)

14813 of 124516 relevant lines covered (11.9%)

26566.53 hits per line