Update to Minecraft 1.9

By: md_5 <git@md-5.net>

paper-server/nms-patches/BlockMinecartTrackAbstract.patch

@@ -1,11 +1,10 @@
 --- a/net/minecraft/server/BlockMinecartTrackAbstract.java
 +++ b/net/minecraft/server/BlockMinecartTrackAbstract.java
-@@ -87,7 +87,7 @@
-                 flag = true;
-             }
+@@ -10,6 +10,7 @@
+     protected static final AxisAlignedBB b = new AxisAlignedBB(0.0D, 0.0D, 0.0D, 1.0D, 0.15625D, 1.0D);
+     protected final boolean c;
  
--            if (flag) {
-+            if (flag && !world.isEmpty(blockposition)) { // CraftBukkit - SPIGOT-424, MC-73474
-                 this.b(world, blockposition, iblockdata, 0);
-                 world.setAir(blockposition);
-             } else {
++    // PAIL: We stage this entire file just to unsynthetic this method. We should rename and AT it in future
+     public static boolean b(World world, BlockPosition blockposition) {
+         return i(world.getType(blockposition));
+     }