Fixed incorrect error types. Added missing error string prefixes.
Removed some invalid or superfluous error emissions. Clarified some
error strings. Joined error string lines to aid grep. Replaced some
generic error strings with specific ones. Documentation work.
Fixes#450.
The context related parts of _GLFWwndconfig have been moved to
_GLFWctxconfig and given better names. Window hint and attribute
members have been renamed to match.
The default behavior of WGL, EGL and GLX is to choose a config that has
/at least/ the specified number of bits, whereas the GLFW 2 behavior was
to choose the closest match with very few hard constraints. Moving the
responsibility of finding the supported minimum values to the client was
problematic, as there's no way to enumerate supported configurations,
forcing the client to perform multiple (and slow) window/context
creation attempts. Not even the currently set defaults (24-bit color
and depth, 8-bit stencil) is universally supported, as bug reports show.
The public, platform, native, event and utility functions are already
documented in-source. Having duplicate documentation inevitably means
having them contradict one another. Furthermore, most of the function
descriptions simply repeated the name of the function.
Renamed _glfwLibrary to _glfw and made all substructs lower-case, making
global variable names easier to read and type. Partially inspired by the
internal naming conventions of glwt.
