[rfc][icedtea--web] fix itweb dual config mechanism broken by recent PathsAndFiles changes

[Jiri Vanek]

Hi!

Today Iwonted to add "reset to default" button to temporary internet files pane in itweb settings 
(as it is heavily missing) and found, that I broke the system of change/(cancel x ok/apply) 
mechanism in itweb-settings.

This patch is adding the "reset button" and fixing this behaviour.


The issue is, that itweb-settings (then and only them) are  working with *two* config instances. So 
they canallow those cancel/apply schema. By moving to PathsAndFiles + getter/setter the second 
config was lost.

So I have reverted all those constructor(config) -> constructor() changes and added stub to 
PathsAndFiles which allows to set/get from those secondar prperties. Not nicest:-/


Maybe some abstraction like ItwebSettings configurable file ? Maybe I will find something tomorow, 
maybe reviwer will.

Still this is important to fix:(


J.
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