Weapon system refactoring

core/src/mindustry/entities/units/WeaponMount.java

@@ -13,12 +13,12 @@ public class WeaponMount{
     public float targetRotation;
     /** aiming position in world coordinates */
     public float aimX, aimY;
-    /** side that's being shot - only valid for mirrors */
-    public boolean side;
     /** whether to shoot right now */
     public boolean shoot = false;
     /** whether to rotate to face the target right now */
     public boolean rotate = false;
+    /** extra state for alternating weapons */
+    public boolean side;
 
     public WeaponMount(Weapon weapon){
         this.weapon = weapon;