move ICrop over from natura

src/mantle/blocks/iface/ICrop.java

@@ -0,0 +1,34 @@
+package mantle.blocks.iface;
+
+
+import java.util.Collections;
+import java.util.List;
+
+import net.minecraft.item.ItemStack;
+import net.minecraft.util.BlockPos;
+import net.minecraft.world.IBlockAccess;
+
+public interface ICrop
+{
+    public enum HarvestType
+    {
+        BREAK, USE, MACHINE
+    }
+
+    public static final List<ItemStack> NO_YIELD = Collections.emptyList();
+
+    /**
+     *
+     * @param world
+     * @param pos
+     * @param type
+     * @return A list of items harvested. If no items are returned, NO_YIELD should be passed.
+     */
+    public List<ItemStack> harvestCrop (IBlockAccess world, BlockPos pos, HarvestType type);
+
+    public boolean isFullyGrown (IBlockAccess world, BlockPos pos);
+
+    public boolean hasYield (IBlockAccess world, BlockPos pos);
+
+    public void growthTick (IBlockAccess world, BlockPos pos);
+}