[rfc][icedtea-web][policyeditor] Disable "paste" until "copy" is performed

[Andrew Azores]

Hi,

This patch adds a check in the "paste" button action so that the dialog 
prompting the user for the new URL to paste with does not appear if a 
codebase has not been previously copied. This would also guard against 
the dialog appearing when a keyboard shortcut is used to paste. 
Additionally, the "paste" button in the Edit menu is now disabled until 
"copy" has been pressed for the first time.

Thanks,

-- 
Andrew A

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