[rfc][icedtea-web][itweb-settings] Improve Icedtea-Web cache disk space

[Lukasz Dracz]

Hello,

Here is the updated patch on the cache size spinner that addresses the bug PR1857. A JLabel is now present under
the spinner to tell the user available disk size and the maximum allowable number for the cache size. The spinner
also changes colour to yellow when the user goes over 0.5% of the usable disk space. It turns to red if the user makes the spinner go past the usable disk space size and changes the JLabel to display a warning. Also the cache panel was put into a scroll pane so that the "view files" button is not in the default view or when resized to smaller.

Thank you,
Lukasz Dracz
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