Actually hide filled volumetric flask in NEI

[Glease]

This functionality was added at day 0 but it never worked perfectly. Previously this is called too early that many GT fluid are simply not yet registered.

Hiding filled volumetric flask should do no harm to daily fluid recipe/usage look up. Filled universal cells (or even crystal capsules) are not hidden so they can be used instead.

Extra care was taken to prevent the filter from hiding the empty volumetric flask, which would prevent looking up the recipe of flask itself.

[draknyte1]

Doesn’t GT have hard dependencies on NEI? @optional is kinda pointless cause nowhere else in the mod does so for NEI.

[Glease]

I'm not quite sure about that, but the original code does check for NEI, so I just carried it over.

[glowredman]

Wouldn't
codechicken.nei.api.API.hideItem(new ItemStack(staticReferenceToVolmetricFlaskItem)); to hide everything and codechicken.nei.api.API.addItemListEntry(new ItemStack(staticReferenceToVolmetricFlaskItem)); to show a empty flask do the trick?
Or codechicken.nei.api.API.setItemListEntries(staticReferenceToVolmetricFlaskItem, java.util.Arrays.asList(new ItemStack(staticReferenceToVolmetricFlaskItem)));

Also, maybe but the handling in gregtech.nei.GT_NEI_DefaultHandler because of this.

[Glease]

It seems adding just one override is enough to persuade NEI not to search for subitems.