Make a "unitCommandPosition" event so that unit commands issued to non-attack coordinates can still be listened for (#9650)

* Update InputHandler.java

Make commandTap fire a Trigger.unitCommandPosition (in the event that it doesn't fire a Trigger.unitCommandAttack)

* Update EventType.java

Add "unitCommandPosition" to Trigger, for when selected units are commanded to move to a position (without that position being an attack).

core/src/mindustry/game/EventType.java

@@ -39,6 +39,7 @@ public class EventType{
         socketConfigChanged,
         update,
         unitCommandChange,
+        unitCommandPosition,
         unitCommandAttack,
         importMod,
         draw,

core/src/mindustry/input/InputHandler.java

@@ -1012,6 +1012,8 @@ public abstract class InputHandler implements InputProcessor, GestureListener{
 
                 if(attack != null){
                     Events.fire(Trigger.unitCommandAttack);
+                }else{
+                    Events.fire(Trigger.unitCommandPosition);
                 }
 
                 int maxChunkSize = 200;