[rfc][icedtea-web] Backport unsigned applet confirmation to icedtea-web 1.2

[Adam Domurad]

NB: This is a work in progress, posting for early feedback.

So a back-port was requested for 1.2 for systems that still use it. I 
tried to use as much already-reviewed material as possible while 
retaining simplicity.

The whitelist attempts to be forwards compatible with the patch aimed at 
HEAD, but generally it does plain string matching without regex.

The icedtea-web settings panel simply has a box that changes the 
security level, and a button to clear the current whitelist.

I *think* everything is working, but I was in a rush posting this, so 
let me know. There are a few println statements left in, but again, rush.

This is of course meant to be applied to the 1.2 release branch.

Cheers,
-Adam
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