[rfc][icedtea-web] remeberable dialogues editor -base class and design

[Jiri Vanek]

The patch is called dirty because I accidently made it on top of CpartEscapeSomeProperties :-/

It is showing main principles of the editor fo remberable dialogues. + add new dialogue, - remove 
current. The expert button is to edit the line of record manually.

The dialog currently does nearly nothing (and what it dos it does wrongly) but is nice tech preview.


J.
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