some improve game ui and bugfixes

form.h

@@ -23,12 +23,14 @@ private slots:
     void on_pbNextWave_clicked();
     void towerBuild(int index);
     void towerMorph(int index);
-    void add_tow(QPoint pnt);
+    void add_tow(QPoint pnt, bool shift);
     void selectedTowerChanged(QPoint id);
     void cancel();
 
     void on_sbSpeed_valueChanged(double arg1);
 
+    void on_pbSell_clicked();
+
 private:
     void timerEvent(QTimerEvent *);
     Ui::Form *ui;
@@ -37,6 +39,7 @@ private:
     AD_Graphics * graphics;
     TouchButtFrame * morphtbf, * tbf;
     QList<QPixmap> cursors;
+    QList<int> buildTowers;
 
 //signals:
 //    void tower_killed();