Remove TitleFooter.
Remove ChannelResultFooter.
Remove unused import of BundleListView in TopSearchPanel.py.
Remove StringProgressPanel.
Remove MyChannelDetails.
Remove SearchHelpHeader.
Remove VideoMacFrame.
Remove unused import in MainVideoFrame.py.
Remove unused import in settingsDialog.py.
Remove unused import in TopSearchPanel.py.
Remove unused import in widgets.py.
Remove unused import in home.py.
Remove unused import in gaugesplash.py.
Remove unused file logging_util.py.
Remove unused import in MainFrame.py.
Remove unused DEBUG in GUITaskQueue.py.
Remove unused import SwiftDef in AddTorrent.py.
Remove unused import in SaveAs.py.
Overwrite _periodically cleanup candidate such that it doesn't get
registered
Merge pull request #401 from LipuFei/gui-widget-cleanup

GUI cleanup