Initial reconstructor impl

core/src/mindustry/ai/BlockIndexer.java

@@ -437,7 +437,7 @@ public class BlockIndexer{
         }
     }
 
-    private class TileIndex{
+    private static class TileIndex{
         public final EnumSet<BlockFlag> flags;
         public final Team team;
 

core/src/mindustry/ai/Pathfinder.java

@@ -330,7 +330,7 @@ public class Pathfinder implements Runnable{
     }
 
     /** Data for a specific flow field to some set of destinations. */
-    class PathData{
+    static class PathData{
         /** Team this path is for. */
         final Team team;
         /** Flag that is being targeted. */