Added Show/Hide GasMask

[AremiWic]

Add the ability to disable the gasmask interface

for example, like health
Player.setPluginWidgetFlag(EPluginWidgetFlags.ShowHealth, false);

added mb?
Player.setPluginWidgetFlag(EPluginWidgetFlags.ShowGasMask, false);

[Jdance-Media]

I'd have to agree on this one. Seems like something that probably should've had a flag to begin with.