* integrated first draft for gfx layer using C-API for OpenGL and DX11
 * integrated base GFX DLL loading routine into G2Core for loading a shared library during runtime (WIP)
 * [OpenGL] implemented General API and Shader API for GLSL and Cg
 * [DX11] implemented General API and Shader API for Cg (not tested)
 * adapted all samples to load and use the new GEARGL.dll during runtime