azul3d_mandel: utilize gfxutil.OpenShader; See azul3d/gfx#73
azul3d_rtt: utilize gfxutil.OpenShader; See azul3d/gfx#73
azul3d_stencil: utilize gfxutil.OpenShader; See azul3d/gfx#73
azul3d_texcoords: utilize gfxutil.OpenShader; See azul3d/gfx#73
azul3d_triangle: utilize gfxutil.OpenShader; See azul3d/gfx#73