just to change from disabling spawn chunks to control over its size. Removes disableSpawnChunks, adds spawnChunksSize. Fixes #192

src/main/java/carpet/fakes/ServerChunkManagerInterface.java

@@ -0,0 +1,8 @@
+package carpet.fakes;
+
+import net.minecraft.server.world.ChunkTicketManager;
+
+public interface ServerChunkManagerInterface
+{
+    ChunkTicketManager getTicketManager();
+}