Feature Request: Autosave

[tacruc]

First of all, thanks for this nice plugin. Every time I edit the options Page I forget to save the options. First I thought the app is not working, than I figured out that there is a save button, but still I tend to forget this. Specially when you add some regex this is annoying.

[ray-lothian]

autosaving can mess up the options since we don't have the undoing feature. Instead, the options page has a new feature to warn the user on exit if there are unsaved changes.