Implemented standalone server, fixed breaking bugs

core/src/io/anuke/mindustry/net/Net.java

@@ -15,6 +15,9 @@ import io.anuke.ucore.function.Consumer;
 
 import java.io.IOException;
 
+import static io.anuke.mindustry.Vars.headless;
+import static io.anuke.mindustry.Vars.ui;
+
 public class Net{
 	public static final int version = 13;
 
@@ -29,6 +32,15 @@ public class Net{
 
 	private static IntMap<StreamBuilder> streams = new IntMap<>();
 
+	/**Display a network error.*/
+	public static void showError(String text){
+		if(!headless){
+			ui.showError(text);
+		}else{
+			UCore.log(text);
+		}
+	}
+
 	/**Sets the client loaded status, or whether it will recieve normal packets from the server.*/
 	public static void setClientLoaded(boolean loaded){
 		clientLoaded = loaded;

core/src/io/anuke/mindustry/net/NetworkIO.java

@@ -266,7 +266,7 @@ public class NetworkIO {
             world.loadMap(world.maps().getMap(mapid), seed);
             renderer.clearTiles();
 
-            player.set(world.getCore().worldx(), world.getCore().worldy());
+            player.set(world.getSpawnX(), world.getSpawnY());
 
             for(int x = 0; x < world.width(); x ++){
                 for(int y = 0; y < world.height(); y ++){