Simple Fetures Lock and export

Added two Button to bottom of list for exporting and importing saved windows.
Added Locking feature that the locked window can't be changed. In the Image both tabs have 3 windows open but the locked window only is listed as having one.

![image](https://f.cloud.github.com/assets/1568235/2301387/71693d80-a140-11e3-9a9e-e088df3e61ce.png)