more undo commands

- add edit command for duplicating map events
- add edit commands for painting map collision
- edit commands that delete events now select
  the proper next event

include/ui/collisionpixmapitem.h

@@ -14,6 +14,7 @@ public:
         : MapPixmapItem(map, metatileSelector, settings){
         this->movementPermissionsSelector = movementPermissionsSelector;
         this->opacity = opacity;
+        map->setCollisionItem(this);
     }
     MovementPermissionsSelector *movementPermissionsSelector;
     qreal *opacity;
@@ -24,6 +25,9 @@ public:
     virtual void pick(QGraphicsSceneMouseEvent*);
     void draw(bool ignoreCache = false);
 
+private:
+    unsigned actionId_ = 0;
+
 signals:
     void mouseEvent(QGraphicsSceneMouseEvent *, CollisionPixmapItem *);
     void hoveredMapMovementPermissionChanged(int, int);

include/ui/mappixmapitem.h

@@ -69,7 +69,7 @@ private:
     void paintSmartPath(int x, int y, bool fromScriptCall = false);
     static QList<int> smartPathTable;
 
-    unsigned eventId_ = 0;
+    unsigned actionId_ = 0;
 
 signals:
     void startPaint(QGraphicsSceneMouseEvent *, MapPixmapItem *);