PIVOT-947: Add hooks to VFS Browser dialog to add components.
* Add two methods to the TerraVFSBrowserSheetSkin:
. "addLabelComponent"
. "getBrowser"
* Implement "addLabelComponent" there by adding the component to the "hostNameBoxPane".
* Add new constructor to VFSBrowserSheet to take FileObject values instead of Strings.
* Extend the VFSBrowser.Skin interface to add an "addActionComponent" method and implement
it by deferring to the real skin.
* Make the button BoxPane accessible to the TerraVFSBrowserSkin from the bxml and implement
"addActionComponent" by adding the new component there.
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