Added MaterialData support for SAPPLING, POWERED_RAIL, and DETECTOR_RAIL.

By: sunkid <sunkid@iminurnetz.com>

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

@@ -0,0 +1,34 @@
+package org.bukkit.material;
+
+import org.bukkit.Material;
+
+/**
+ * This is the superclass for the {@link DetectorRail} and {@link PoweredRail} classes
+ */
+public class ExtendedRails extends Rails {
+    public ExtendedRails(final int type) {
+        super(type);
+    }
+
+    public ExtendedRails(final Material type) {
+        super(type);
+    }
+
+    public ExtendedRails(final int type, final byte data) {
+        super(type, data);
+    }
+
+    public ExtendedRails(final Material type, final byte data) {
+        super(type, data);
+    }
+
+    @Override
+    public boolean isCurve() {
+        return false;
+    }
+
+    @Override
+    protected byte getConvertedData() {
+        return (byte) (getData() & 0x7);
+    }
+}