feat: support move image file to trash

Resolve: BLumia/pineapple-pictures#42

app/actionmanager.h

@@ -40,6 +40,7 @@ public:
     QAction *actionCopyPixmap;
     QAction *actionCopyFilePath;
     QAction *actionPaste;
+    QAction *actionTrash;
     QAction *actionToggleStayOnTop;
     QAction *actionToggleProtectMode;
     QAction *actionToggleAvoidResetTransform;