Created by Guillaume Chereau and last modified
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6360. By Alexander Wolf

sync with trunk

6359. By Alexander Wolf

sync with trunk

6358. By Guillaume Chereau

use power of two sized buffer for the font texture cache

We could check of the GPU supports NPOT texture, but in fact I think it does
not make much difference anyway, so it is easier to always assume that we don't
support NPOT textures.

6357. By Guillaume Chereau

minor change in font texture buffer size with a global scale

6356. By Guillaume Chereau

minor change: release font texture buffer when we are done with it

This does not seem to make any difference, but still better to do it I guess.

6355. By Guillaume Chereau

StelPainter: clear text texture cache at exit

6354. By Guillaume Chereau

use a QPixmap instead of a QImage in the text buffer creation

I am not sure why, but the result looks a bit different.

6353. By Guillaume Chereau

use a QOpenglTexture to cache the rendered texts

This fixes a bug on windows, where the text is sometime scrambled.

The text looks thiner than before, and this might not be a good thing, also it
does not work on hardware with only power of two textures yet.

6352. By Fabien Chéreau

Properly fixed refraction shaking bug. Double precision is unfortunately required.

6351. By Fabien Chéreau

Reduced planet shaking when zooming in with refraction

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