Use graphics backend in GLideNHQ

[loganmc10]

This is a fix for #1765

GLideNHQ still references OpenGL directly. This is just a refactor to have it go through the graphics backend.

I had to change the switch statements to if/else because the compiler would not accept case u32(graphics::internalcolorFormat::RGBA8): type statements.

[loganmc10]

The only other real change I made was:

InternalColorFormatParam RGB8(GL_RGB8);

so internalcolorFormat::RGB8 now equals GL_RGB8 instead of GL_RGB, the internal color formats should be sized.

I cannot figure out why the AppVeyor build is failing, it says:

..\..\src\Graphics\OpenGLContext\opengl_Parameters.cpp(7): warning C4003: not enough actual parameters for macro 'RGB' [C:\projects\gliden64\projects\msvc2015\GLideN64.vcxproj]

..\..\src\Graphics\OpenGLContext\opengl_Parameters.cpp(7): error C2143: syntax error: missing ')' before '(' [C:\projects\gliden64\projects\msvc2015\GLideN64.vcxproj]

It compiles in Linux, I'm not sure what the issue is.

[loganmc10]

Ok I figured it out, Windows has a built-in macro called RGB. I renamed the colorFormat macro to RED_GREEN_BLUE. I tried doing an #undef RGB at the top of the header file but it didn't seem to work