[BREAKING] Update BlockFace directions. Fixes BUKKIT-1567, BUKKIT-3069

If you use BlockFace in any way, to compensate the directionals being incorrect, you can still have backwards compatibility if you add in the handling in your plugin:
boolean legacyBlockFace = BlockFace.NORTH().getModX() == -1; (and then handle it accordingly)

If you didn't special case your directions to fix what's being fixed here... Hurray! Your plugin should now work.

By: feildmaster <admin@feildmaster.com>

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

@@ -59,23 +59,23 @@ public class Rails extends MaterialData {
         switch (d) {
         case 0x0:
         default:
-            return BlockFace.WEST;
+            return BlockFace.SOUTH;
 
         case 0x1:
-            return BlockFace.SOUTH;
-
-        case 0x2:
-            return BlockFace.SOUTH;
-
-        case 0x3:
-            return BlockFace.NORTH;
-
-        case 0x4:
             return BlockFace.EAST;
 
-        case 0x5:
+        case 0x2:
+            return BlockFace.EAST;
+
+        case 0x3:
             return BlockFace.WEST;
 
+        case 0x4:
+            return BlockFace.NORTH;
+
+        case 0x5:
+            return BlockFace.SOUTH;
+
         case 0x6:
             return BlockFace.NORTH_EAST;
 
@@ -116,19 +116,19 @@ public class Rails extends MaterialData {
      */
     public void setDirection(BlockFace face, boolean isOnSlope) {
         switch (face) {
-        case SOUTH:
+        case EAST:
             setData((byte) (isOnSlope ? 0x2 : 0x1));
             break;
 
-        case NORTH:
+        case WEST:
             setData((byte) (isOnSlope ? 0x3 : 0x1));
             break;
 
-        case EAST:
+        case NORTH:
             setData((byte) (isOnSlope ? 0x4 : 0x0));
             break;
 
-        case WEST:
+        case SOUTH:
             setData((byte) (isOnSlope ? 0x5 : 0x0));
             break;