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

[Lukasz Dracz]

Hello,

Okay so this patch, uses disabling/enabling instead of hiding/showing. Also put the "Java stores application ..." description to always be at the top where as the rest of the components will be centered.
Also changed from powers of two to increments of 10 but not jumps of 1,10,100,1000,10000 etc. but instead to
0,1,2,3,...,7,8,9,10,20,30...80,90,100,200,300...800,900,1000,2000,3000 etc. I think this way is best as it does not jump to the larger values too quickly.

As for my opinion, I think disabling is better than hiding, as it still shows the user the possibilities in the panel even though they are not active. I also liked the powers of two spinner much more personally but from a user's point of view I agree that increments of 10 are more intuitive and easier to understand.

Thank you,
Lukasz Dracz
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