Enabled sRGB framebuffer.

- Added 2 more separaters for logging (each half the size of the previous).
- Modified linear_ramp image to be more useful (can tell top from bottom now).
- sprite_component tex_coords were upside down (at least for loaded images since they'll have
  the top left as the origin with increasing y moving downard - vs OpenGL convention of positive
  y moving upward).
- Separated GLEW init code into graphics_system (which is otherwise currently unused).
- Added printing of SDL_GL_GetAttributes to verify what we actually recieve form the OS.