Various fixes to qlo10k1

Various fixes by Tim <terminator356@users.sourceforge.net>:

- ld10k1 0.1.8p1 recommended for best operation.
- Fixed link disconnect bug.
- Now remembers last file open/save dir.
- Now unused IO/FX do not disappear upon refresh.
- Refresh/redraw fixups.

qlo10k1/src/mainwnd.h

@@ -52,6 +52,10 @@ public:
 	void loadSettings();
 	
 	void patchesUpdateText();
+
+protected:
+	void closeEvent(QCloseEvent*);
+
 public slots:
 	// menu
 	void menuLoadDSPConfigActivated(int id);