Fix casing exploit, change recipes for tfc alloys

[Pyritie]

Changed the LV casing assembler recipe so it always requires colored steel. This matches the behaviour in 0.8.1.
This also stops exploits like getting infinite iron from dusts and then turning it into other metals through the arc furnace.

I have also changed the other gregtech equivalents of tfc alloys, so they are easier to craft by machine.
Black bronze, bismuth bronze, sterling silver, and rose gold dust now only need a steam/electric furnace.
Black/red/blue steel need an arc furnace, so they are a bit later in LV.
Normal steel is unchanged.
This way, players can stop using their TFC blast furnace and crucible once they're in LV.

Please let me know what you think!

[fluffle]

I think I'd prefer it if you just made the arc furnace / macerator return 8 steel dust -- being able to make LV machine casings from steel once you get an LV assembler is quite a nice leg up in mid LV. Just my $0.02 :-)

[Pyritie]

True, but adding arc furnace + macerator recipes for every single machine sounds like a hassle lol - from what I can tell, they're auto generated from whatever the normal crafting recipe is

[Pyritie]

Also, I'm just trying not to step on except1on's toes too much -- if I was designing this, I'd do something like only make lv ones need black steel, and have mv need the coloreds instead, because right now mv hulls feel way too easy compared to lv ones