Added more replacement for turrets/conveyors/junctions/routers

core/src/io/anuke/mindustry/world/blocks/types/defense/Turret.java

@@ -43,6 +43,11 @@ public class Turret extends Block{
 		solid = true;
 	}
 	
+	@Override
+	public boolean canReplace(Block other){
+		return other instanceof Turret;
+	}
+	
 	@Override
 	public void draw(Tile tile){
 		Vector2 offset = getPlaceOffset();

core/src/io/anuke/mindustry/world/blocks/types/distribution/Conveyor.java

@@ -27,8 +27,9 @@ public class Conveyor extends Block{
 		update = true;
 	}
 	
+	@Override
 	public boolean canReplace(Block other){
-		return other instanceof Conveyor;
+		return other instanceof Conveyor || other instanceof Router || other instanceof Junction;
 	}
 	
 	@Override

core/src/io/anuke/mindustry/world/blocks/types/distribution/Junction.java

@@ -13,6 +13,11 @@ public class Junction extends Block{
 		solid = true;
 	}
 	
+	@Override
+	public boolean canReplace(Block other){
+		return other instanceof Conveyor || other instanceof Router;
+	}
+	
 	@Override
 	public void handleItem(Tile tile, Item item, Tile source){
 		int dir = source.relativeTo(tile.x, tile.y);

core/src/io/anuke/mindustry/world/blocks/types/distribution/Router.java

@@ -19,6 +19,11 @@ public class Router extends Block{
 		solid = true;
 	}
 	
+	@Override
+	public boolean canReplace(Block other){
+		return other instanceof Junction || other instanceof Conveyor;
+	}
+	
 	@Override
 	public void update(Tile tile){
 		if(Timers.get(tile, 2) && tile.entity.totalItems() > 0){