Remove deprecated OpenGL 1.1 Fixed Function Pipeline Renderer

[Stan]

While still functionnal the Fixed Function Pipeline code is old, OpenGL 1.1. is very old (1997!) too, it is slow, it’s not very well tested, as it’s not possible to enable it through the options (albeit the hardware detection can force it), and while it works, it will crash if any of the new features e.g. postprocessing are enabled. And the last one is the fact it was marked as deprecated almost 7 years ago: in r13156. The only argument “for” that I can find is that some users (62/10000+) use it.

[Vladislav Belov]

Also I think the game is pretty unplayable without shaders.

[Stan]

Well it looks bad

[fabio]

Also discussed in this forum thread: ​https://wildfiregames.com/forum/index.php?/topic/16734-important-please-read-if-you-have-an-older-computer-or-graphics-card/

[Vladislav Belov]

In 25717:

Removes FFP shader program. Fixes #5791

[fabio]

hwdetect.js and default.cfg should also be cleaned up after the removal of the fixed shader.

[fabio]

Replying to fabio:

hwdetect.js and default.cfg should also be cleaned up after the removal of the fixed shader.

See #6244 as a followup.