Add support for levers being attached up and downwards.

Fixes SPIGOT-177.

By: FearThe1337 <admin@fearthe1337.com>

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

@@ -73,6 +73,9 @@ public class Button extends SimpleAttachableMaterialData implements Redstone {
         byte data = (byte) (getData() & 0x7);
 
         switch (data) {
+        case 0x0:
+            return BlockFace.UP;
+
         case 0x1:
             return BlockFace.WEST;
 
@@ -84,6 +87,9 @@ public class Button extends SimpleAttachableMaterialData implements Redstone {
 
         case 0x4:
             return BlockFace.SOUTH;
+
+        case 0x5:
+            return BlockFace.DOWN;
         }
 
         return null;
@@ -96,6 +102,10 @@ public class Button extends SimpleAttachableMaterialData implements Redstone {
         byte data = (byte) (getData() & 0x8);
 
         switch (face) {
+        case DOWN:
+            data |= 0x0;
+            break;
+
         case EAST:
             data |= 0x1;
             break;
@@ -111,6 +121,10 @@ public class Button extends SimpleAttachableMaterialData implements Redstone {
         case NORTH:
             data |= 0x4;
             break;
+
+        case UP:
+            data |= 0x5;
+            break;
         }
 
         setData(data);