I removed GLEW, added glLoadGen (renamed to GL here), and added implementations for all platforms. Hopefully this goes better than GLAD did.

For one, I added a new member gs_window for future use.
The member is "display" which represents our connection to X11.
Ideally, we should use this specific connection to deal with our Window.
For now, it's disabled. Read comment for more information.

Secondly, wxGTK apparently doesn't map our window in some cases.
This causes the window ID passed to be bad and will stop (or segfault)
our program. This might be related to the first commit above.

For now, all this commit does is realize the window manually.

This fixes segfaults when the error code is not in the table

I also fixed autoconf to find wxWidgets 2.9 without user intervention
Removed unused code and added more organization

Fixed the location glewExperimental was being set to just before glewInit() (where it should be).

Fix previous commit..

1. We no longer hardcode a 3.2 profile. It chooses the latest profile that fits out description.
2. I added three tables and macros to help with the offsets compared to the variables to help reading. Read comments for more info.
3. I added glewExperimental being set. What a dumb "feature". It doesn't help anything...

I added gl-x11 which allows compatibility with X11 (Xlib-based) and GLX.
I also added various functions to handle file finding based on FHS.
Various changes to autotools to both install files correctly and to configure correctly.