change names, fix some bugs, minor GL/D3D fixes, update tests, fix effect files, output a little more debug information

modernize header guards to #pragma once

added first GLSL code, moved some graphics functions around, and adjusted some existing shader parser code

clean up pixel unpack buffer for dynamic textures, and add some more error handling code for other GL functions

update graphics subsystem code to add mipmap support and also add initial GL texture stuff and helper functions