Extra legacy block substitution / iOS fixes

core/src/mindustry/world/blocks/legacy/LegacyBlock.java

@@ -8,4 +8,9 @@ public class LegacyBlock extends Block{
     public LegacyBlock(String name){
         super(name);
     }
+
+    /** Removes this block from the world, or replaces it with something else. */
+    public void removeSelf(Tile tile){
+        tile.remove();
+    }
 }

core/src/mindustry/world/blocks/legacy/LegacyUnitFactory.java

@@ -1,9 +1,12 @@
 package mindustry.world.blocks.legacy;
 
 import arc.util.io.*;
+import mindustry.content.*;
 import mindustry.gen.*;
+import mindustry.world.*;
 
 public class LegacyUnitFactory extends LegacyBlock{
+    public Block replacement = Blocks.air;
 
     public LegacyUnitFactory(String name){
         super(name);
@@ -13,6 +16,12 @@ public class LegacyUnitFactory extends LegacyBlock{
         solid = false;
     }
 
+    @Override
+    public void removeSelf(Tile tile){
+        int rot = tile.build == null ? 0 : tile.build.rotation;
+        tile.setBlock(replacement, tile.team(), rot);
+    }
+
     public class LegacyUnitFactoryBuild extends Building{
 
         @Override