Bullet mover cleanup

core/src/mindustry/entities/Mover.java

@@ -1,9 +1,8 @@
 package mindustry.entities;
 
-import arc.math.geom.*;
 import mindustry.gen.*;
 
 /** Applies custom movement to a bullet. */
 public interface Mover{
-    float move(Bullet bullet);
+    void move(Bullet bullet);
 }