Global GLQuake2 variables

These variables work in GLQuake2, and are not board/renderer specific.

set cl_particles "1"
set gl_dynamic "0"
set gl_polyblend "0"
set gl_playermip "2"
set gl_keeptjunctions "0"
set gl_flashblend "0"
set gl_ext_swapinterval "1"
set gl_swapinterval "0"
set gl_ztrick "1"

To get these functions to work properly, they should be added to your config.cfg or autoexec.cfg.