implement the ui part for the OpenGL config variables

Change-Id: I46e2de444d38f1f93eb68ffd50b7a283d05d1738
make use of the new ForceOpenGL config variable

Change-Id: Ifdfcbd9d3d62d2a55e3e050d4723700f8436e57a
after resetting the values are not modified

Change-Id: I0211c9c7dcc24ce40fe7c573f35ac13c02e742c1