[icedtea-web] Idea - do not start ITW applets automatically

[helpcrypto helpcrypto]

> I kind of like how Oracle handled this, with a checkbox 'remember this
> option'. So yes + check = always, no + check = never.

like++

> Ya good point, should be per-applet. The white/black-list will need to be
> per-applet too (only setting for iteration 1 at least), which I hadn't
> considered. We'll probably have to use the concept of applet 'unique key'
> here.

Will this mean the warning will appear after each applet new release?
We do some minor bug correction in our code, but don't want to annoy
users each time!
(Although, to be honest, we use a signed applet, so this is not for us...)