[rfc][icedtea-web][policyeditor] MVC-ish refactor

[Andrew Azores]

Hi,

This patch extracts some logic out of PolicyEditor into a new class, 
PolicyEditorController, so that other "Views" can be more easily made in 
the future, the first planned one being a purely CLI interface for 
PolicyEditor. Future work could also include having changes to the Model 
actually update the View(s). Currently, the View (PolicyEditor) simply 
updates its UI based on requests it makes to the PolicyEditorController 
and return values that come back, which is the same as how it is before 
this patch, except the PolicyEditor called directly into the 
PolicyFileModel.

Additionally, file IO in the Controller is synchronous, so opening and 
saving policy files in PolicyEditor is a SwingWorker async wrapper 
around this essentially. This fact is leveraged when the PolicyEditor is 
being exited with changes to be saved first, and the synchronous IO is 
used instead with additional dialogs *not* shown. This works around the 
buggy behaviour when spawning modal child dialogs when the parent has 
already disappeared, which could cause the JVM not to exit.

Thanks,
-- 
Andrew Azores
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