More cleanup

core/src/mindustry/entities/traits/BuilderTrait.java

@@ -229,7 +229,7 @@ public interface BuilderTrait extends Entity, TeamTrait{
 
     //due to iOS weirdness, this is apparently required
     class BuildDataStatic{
-        static Vector2[] tmptr = new Vector2[]{new Vector2(), new Vector2(), new Vector2(), new Vector2()};
+        static Vec2[] tmptr = new Vec2[]{new Vec2(), new Vec2(), new Vec2(), new Vec2()};
     }
 
     /** Draw placement effects for an entity. */

core/src/mindustry/entities/traits/SolidTrait.java

@@ -11,7 +11,7 @@ public interface SolidTrait extends QuadTreeObject, MoveTrait, VelocityTrait, En
 
     void hitboxTile(Rectangle rectangle);
 
-    Vector2 lastPosition();
+    Vec2 lastPosition();
 
     default boolean collidesGrid(int x, int y){
         return true;

core/src/mindustry/entities/traits/VelocityTrait.java

@@ -1,11 +1,11 @@
 package mindustry.entities.traits;
 
-import arc.math.geom.Vector2;
+import arc.math.geom.Vec2;
 import arc.util.Time;
 
 public interface VelocityTrait extends MoveTrait{
 
-    Vector2 velocity();
+    Vec2 velocity();
 
     default void applyImpulse(float x, float y){
         velocity().x += x / mass();