[rfc][icedtea-web] dialogue for set jre dir

[Jiri Vanek]

This is only java part of "make-jredir-configurable after install effort"
To jvm settings pane it adds text-field to allow to write path to jre, whih is then saved to 
properties. There is also button which fill launch jfilechooser (with correct default location) to 
allow to choose the jre directory
And one funny button to validate his effort (with funny colourful messages;). As if the user will 
add wrong location, he will not even start itw-settings (later).


J.
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