Update to Minecraft 1.12-pre2

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

paper-server/nms-patches/PathfinderGoalPanic.patch

@@ -5,11 +5,11 @@
  
      public boolean b() {
 +        // CraftBukkit start - introduce a temporary timeout hack until this is fixed properly
-+        if ((this.b.ticksLived - this.b.hurtTimestamp) > 100) {
-+            this.b.b((EntityLiving) null);
++        if ((this.a.ticksLived - this.a.hurtTimestamp) > 100) {
++            this.a.b((EntityLiving) null);
 +            return false;
 +        }
 +        // CraftBukkit end
-         return !this.b.getNavigation().n();
+         return !this.a.getNavigation().o();
      }