Gl polyblend

Name: gl_polyblend
Default value: "1"
Flags:

0 = Disable palette shifting when submerged or poweruped.
1 = Enable palette shifting when submerged or poweruped.

Enables/Disables the color adjustments when the client picks up a powerup, or the flash when the client picks up an item.

NOTE: because of the way gl_polyblend is implemented, the client will suffer from a significant fillrate hit when whenever the colors have been shifted.