BISERVER-8324 - syncing recents and favorites home widgets with the PUC file menu. also added in a mechanism to allow external things (like plugins) to add a callback for when recents or favorites are changed.

Also added a generic image for unknown file types.
[BISERVER-8859] -  added tooltip text to favorite icons (star)
[BISERVER-8859] -  When the panels are empty there should be a message and an action for the user.

-- Recent Files "You haven't opened anything recently. Browse your files." (without quotes) and the buttons should say "Browse Files"
-- Favorites "You haven't selected any favorites yet. Add some favorites." (without quotes) and the buttons should say "Browse Files"
[BISERVER-8859] -  Added ellipses when text is too long for displayable area rather than wraping text

Also updated the button font size when in an empty-panel (it was too small)
[BISERVER-8859] -  updated file type icons
Merge pull request #390 from rfellows/dev

BISERVER-8324, BISERVER-8859 - UI updates based on UX review of favorites and recents