OpenGL version naming is inconsistent #1097

The version naming in AppSettings is a bit inconsistent, in detail

LWJGL_OPENGL3 should be renamed in LWJGL_OPENGL32
LWJGL_OPENGL30 should be added for gl 3.0
LWJGL_OPENGL4 should be renamed in LWJGL_OPENGL40

The changes can be applied without breaking backward compatibility by deprecating LWJGL_OPENGL3 and LWJGL_OPENGL4 and fixing the renderers to deal with the new naming, see the commented lines in e31fc2c