Felix's Workshop: shader based demo

@All

As a first demo release for Mesa i port "Felix's Workshop" intro created by the French demogroup Ctrl-Alt-Test:

https://www.ctrl-alt-test.fr/productions/f-felixs-workshop/

The intro was released in April 2012 and presented at Revision 2012, where it placed second in the 64 kB competition.

The port retains the original desktop OpenGL renderer and all 53 original vertex and fragment shaders. The shaders are embedded byte-for-byte and have not been translated or replaced.

OS4 executable uses SDL2 (statically linked into binary) over Mesa, and target an OpenGL 3.3 All shaders,fonts,music and other data are embedded. No external data files are required.

By default demo runs in fullscreen, but you can provide --win argument, or simple dbl-click or alt+enter to swith between fullscreen and window.

In window mode you also can see FPS in title bar. Grab it from os4depot upload query and have fun!

And there are video on X1000 with RadeonRX580 and mesa 1.1 in action: