Cables & parts and Baking pipeline

- Added cables & parts rendering.
- Facades got a completely new way of rendering. Anvil facades are
totally a thing.
- Added baking pipeline for simplified, highly configurable quad baking.

NOTE: Yes, there are a lot of improvements to do, bugs to fix, stuff to
add. I'm just pushing it prior to code structure change, so it does not
get lost in stashes. But it actually works!

src/main/java/appeng/items/parts/ItemMultiPart.java

@@ -35,6 +35,8 @@ import javax.annotation.Nullable;
 
 import com.google.common.base.Preconditions;
 
+import net.minecraft.client.renderer.ItemMeshDefinition;
+import net.minecraft.client.renderer.block.model.ModelResourceLocation;
 import net.minecraft.creativetab.CreativeTabs;
 import net.minecraft.entity.player.EntityPlayer;
 import net.minecraft.item.Item;
@@ -81,6 +83,12 @@ public final class ItemMultiPart extends AEBaseItem implements IPartItem, IItemG
 		instance = this;
 	}
 
+	@Override
+	public ItemMeshDefinition getItemMeshDefinition()
+	{
+		return itemstack -> new ModelResourceLocation( getTypeByStack( itemstack ).getModel(), null );
+	}
+
 	@Nonnull
 	public final ItemStackSrc createPart( final PartType mat )
 	{
@@ -177,7 +185,7 @@ public final class ItemMultiPart extends AEBaseItem implements IPartItem, IItemG
 			return EnumActionResult.PASS;
 		}
 
-		return AEApi.instance().partHelper().placeBus( is, pos, side, player, hand, w ) ? EnumActionResult.SUCCESS : EnumActionResult.FAIL;
+		return AEApi.instance().partHelper().placeBus( is, pos, side, player, hand, w );
 	}
 
 	@Override