Added MaterialData support for SAPPLING, POWERED_RAIL, and DETECTOR_RAIL.

By: sunkid <sunkid@iminurnetz.com>

paper-api/src/main/java/org/bukkit/Material.java

@@ -18,7 +18,7 @@ public enum Material {
     DIRT(3),
     COBBLESTONE(4),
     WOOD(5),
-    SAPLING(6, MaterialData.class),
+    SAPLING(6, Tree.class),
     BEDROCK(7),
     WATER(8, MaterialData.class),
     STATIONARY_WATER(9, MaterialData.class),
@@ -39,8 +39,8 @@ public enum Material {
     SANDSTONE(24),
     NOTE_BLOCK(25),
     BED_BLOCK(26, Bed.class),
-    POWERED_RAIL(27),
-    DETECTOR_RAIL(28),
+    POWERED_RAIL(27, PoweredRail.class),
+    DETECTOR_RAIL(28, DetectorRail.class),
     WEB(30),
     WOOL(35, Wool.class),
     YELLOW_FLOWER(37),