[Bleeding] Call BlockRedstoneEvent for all rails. Adds BUKKIT-4080

Previously, Detector Rails were the only rails that properly called
BlockRedstoneEvent when they changed from powered to unpowered. This commit
adds BlockRedstoneEvent calls for both Powered Rails and Activator Rails.

src/main/java/net/minecraft/server/BlockPoweredRail.java

@@ -1,5 +1,7 @@
 package net.minecraft.server;
 
+import org.bukkit.craftbukkit.event.CraftEventFactory; // CraftBukkit
+
 public class BlockPoweredRail extends BlockMinecartTrackAbstract {
     protected BlockPoweredRail() {
         super(true);
@@ -115,9 +117,21 @@ public class BlockPoweredRail extends BlockMinecartTrackAbstract {
         boolean flag1 = false;
 
         if (flag && (l & 0x8) == 0) {
+            // CraftBukkit start
+            if (CraftEventFactory.callRedstoneChange(world, i, j, k, 0, 15).getNewCurrent() <= 0) {
+                return;
+            }
+            // CraftBukkit end
+
             world.setData(i, j, k, i1 | 0x8, 3);
             flag1 = true;
         } else if (!flag && (l & 0x8) != 0) {
+            // CraftBukkit start
+            if (CraftEventFactory.callRedstoneChange(world, i, j, k, 15, 0).getNewCurrent() > 0) {
+                return;
+            }
+            // CraftBukkit end
+
             world.setData(i, j, k, i1, 3);
             flag1 = true;
         }
@@ -129,4 +143,4 @@ public class BlockPoweredRail extends BlockMinecartTrackAbstract {
             }
         }
     }
-}
+}