[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/net/Interpolator.java

@@ -65,4 +65,4 @@ public class Interpolator{
         }
 
     }
-}
+}