Feature request: "Reset to defaults" button

[bconway]

With changes to default block lists and the like, it would be nice to be able to reset uBlock to its default state without need to go into your Chrome profile folder and wipe out settings.

[ghost]

There could be 3 different buttons:

Restore default
Export settings
Import settings

[ialexsilva]

duplicate #137

[gorhill]

Fixed with a61975b.

[bconway]

Great, thanks!