Added a lot of soul stuff.

src/main/java/WayofTime/bloodmagic/api/soul/ISoul.java

@@ -0,0 +1,30 @@
+package WayofTime.bloodmagic.api.soul;
+
+import net.minecraft.item.ItemStack;
+
+public interface ISoul
+{
+    public double getSouls(ItemStack soulStack);
+
+    public void setSouls(ItemStack soulStack, double souls);
+
+    /**
+     * Drains the souls from the soulStack. If all of the souls are drained, the
+     * soulStack will be removed.
+     * 
+     * @param soulStack
+     * @param drainAmount
+     * @return The number of souls drained.
+     */
+    public double drainSouls(ItemStack soulStack, double drainAmount);
+
+    /**
+     * Creates a new ItemStack with the specified number of souls.
+     * Implementation should respect the number requested.
+     * 
+     * @param meta
+     * @param number
+     * @return
+     */
+    public ItemStack createSoul(int meta, double number);
+}