NEW: The Witcher 3 OSE

Hi,

Please find attached a new port - the open-source edition of "The Witcher 3",
a fantasy role-playing game. The original Witcher 3 was released in 2015 to
much critical acclaim. Before release, a Linux version was promised, but never
saw the light of day. Consequently, a group of Linux enthusiasts spent the
better part of the last 3 years on recreating the game engine. They did this
with SDL2 at its core, and as it turns out this is portable and runs on
OpenBSD, too! Still needs ~60-70 patches, but that's still better than
chrome...

I tested it thoroughly over the last 2 weeks. No significant issues found. At
this point, the main limiting factor is our GPU support. I tested it on a
Skylake with HD530 and it runs playable if you set the resolution really low
(640x480 is the lowest) and disable some of the lighting and tessellation
effects in the .ini file. Would be great if someone with a more powerful AMD
GPU could test drive this.

You need the original game data, e.g. from gog.com. Note that 35GB of hard disk
space are needed for the assets.

A few points that I would like feedback on specifically:
- the launch script is kind of convoluted
- some compiler optimizations are in the CMakeLists, like -O3, -ffast-math
- couldn't get gamepad support to work, so I patched it out because it didn't
start up otherwise. Maybe someone can take a look and see what I'm missing?

Thanks...