[formatting] add newline to file(s) (#1508)

* Trail appropriate files with a new line

* For some ironic reason it ignored itself

Probably because it wasn’t tracked/commited yet.

* Rename newlines to server executable naming pattern

core/src/mindustry/io/MapIO.java

@@ -176,4 +176,4 @@ public class MapIO{
     interface TileProvider{
         Tile get(int x, int y);
     }
-}
+}