Prevent unbounded TickList growth on busy servers (>1000 events/tick). This completes another Bleeding request.

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

@@ -2306,8 +2306,14 @@ public class World implements IBlockAccess {
             throw new IllegalStateException("TickNextTick list out of synch");
         } else {
             if (i > 1000) {
+                // CraftBukkit start - if the server has too much to process over time, try to alleviate that
+                if(i > 20 * 1000) {
+                    i = i / 20;
+                } else {
                     i = 1000;
                 }
+                // CraftBukkit end
+            }
 
             for (int j = 0; j < i; ++j) {
                 NextTickListEntry nextticklistentry = (NextTickListEntry) this.K.first();