remove unused r_light_gl.cpp code
remove unused r_field.cpp and r_volume.cpp code.
remove unused code from r_sprite.cpp.
remove unused code from render3.cpp
remove unused glVertex code from trify_generic_polygon.cpp
remove unused glVertex code from r_draw2d.cpp
remove unused glVertex code from r_glbackend.cpp
remove unused glMatrixMode code from r_initgl.cpp
clear ri_halo_num in R_Prepare()
add glew and opengl 2.0 test
test vertex buffer objects
initial test for new game shell
Merge remote-tracking branch 'mcb77/opengles' into mp_ogles

Conflicts:
	CMakeLists.txt
	r_sdl.cpp
testing background texture loading.