[rfc][icedtea-web] Cache viewer cleanup

[Jacob Wisor]

Hello,

* Added closing of cache viewer by ESC key
* Added proper dis-/enabling of cache viewer's buttons
* Added busy mouse cursor indicator when populating the cache viewer

Everything is done on purpose on the AWT thread as before. Although I am personally not in favour of anonymous classes, I have tried to stick to the prevalent coding style.

Unfortunatelly, I was unable to test the cache viewer's behavior because I do not know how to put synthetic cache entries into the cache. Can anyone help me with that? What does a the cache look like when filled with resources? Is there any index file that keeps track of the cache?

Regards,
Jacob
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