Empty flasks can now be refilled (#976)

Right click a water source (any block that uses Material.WATER, same as vanilla potions) to refill it. This removes all potion effects. The model will display without the fluid inside as a visual indicator.

(cherry picked from commit 4c614df)

src/main/java/WayofTime/bloodmagic/proxy/ClientProxy.java

@@ -163,6 +163,9 @@ public class ClientProxy extends CommonProxy
                 if (tintIndex != 0 && tintIndex != 2)
                     return -1;
 
+                if (stack.hasTagCompound() && stack.getTagCompound().hasKey("empty"))
+                    return -1;
+
                 return PotionUtils.getPotionColorFromEffectList(PotionUtils.getEffectsFromStack(stack));
             }
         }, ModItems.POTION_FLASK);