Added support for deep storage unit API, fixes #120

src/main/java/powercrystals/minefactoryreloaded/api/IDeepStorageUnit.java

@@ -0,0 +1,35 @@
+package powercrystals.minefactoryreloaded.api;
+
+import net.minecraft.item.ItemStack;
+
+public interface IDeepStorageUnit {
+
+    /**
+     * @return A populated ItemStack with stackSize for the full amount of
+     * materials in the DSU. <br>
+     * May have a stackSize > getMaxStackSize(). May have a stackSize of
+     * 0 (indicating locked contents).
+     */
+    ItemStack getStoredItemType();
+
+    /**
+     * Sets the total amount of the item currently being stored, or zero if all
+     * items are to be removed.
+     */
+    void setStoredItemCount(int amount);
+
+    /**
+     * Sets the type of the stored item and initializes the number of stored
+     * items to amount.
+     * <p>
+     * Will overwrite any existing stored items.
+     */
+    void setStoredItemType(ItemStack type, int amount);
+
+    /**
+     * @return The maximum number of items the DSU can hold. <br>
+     * May change based on the current type stored.
+     */
+    int getMaxStoredCount();
+
+}