SetPanelButtonFlash

// Make the corresponding panel button on the player's client start or stop
// flashing.
// - oPlayer
// - nButton: PANEL_BUTTON_*
// - nEnableFlash: if this is TRUE nButton will start flashing.  It if is FALSE,
//   nButton will stop flashing.
void SetPanelButtonFlash(object oPlayer, int nButton, int nEnableFlash);