added MaterialData classes and associated Enums for COAL, CROPS, LOG, LEAVES, STEP, and DOUBLE_STEP

By: sunkid <sunkid@iminurnetz.com>

paper-api/src/main/java/org/bukkit/material/Step.java

@@ -0,0 +1,63 @@
+package org.bukkit.material;
+
+import org.bukkit.Material;
+
+/**
+ * Represents the different types of steps.
+ * @author sunkid
+ */
+public class Step extends MaterialData {
+    public Step(final int type) {
+        super(type);
+    }
+
+    public Step(final Material type) {
+        super(type);
+    }
+
+    public Step(final int type, final byte data) {
+        super(type, data);
+    }
+
+    public Step(final Material type, final byte data) {
+        super(type, data);
+    }
+
+    /**
+     * Gets the current Material this step is made of
+     *
+     * @return Material of this step
+     */
+    public Material getMaterial() {
+        switch ((int) getData()) {
+        case 1:
+            return Material.SANDSTONE;
+        case 2:
+            return Material.WOOD;
+        case 3:
+            return Material.COBBLESTONE;
+        case 0:
+        default:
+            return Material.STONE;
+        }
+    }
+
+    /**
+     * Sets the material this step is made of
+     *
+     * @param material New material of this step
+     */
+    public void setMaterial(Material material) {
+        switch (material) {
+        case SANDSTONE:
+            setData((byte) 0x1);
+        case WOOD:
+            setData((byte) 0x2);
+        case COBBLESTONE:
+            setData((byte) 0x3);
+        case STONE:
+        default:
+            setData((byte) 0x0);
+        }
+    }
+}