Move cntwidget to commands.
Get rid of _tabs attribute in CommandDispatcher.
Use object registry for webview.tabbedbrowser.
Get rid of _page attribute of WebView
Use object registry for CompletionView.
Remove _view attribute in BrowserPage.
Add missing objreg import in browser.webpage.
Use object registry for TabbedBrowser in SignalFilter.
Use object registry for Prompt in Prompter.
Add missing parent=None
Privatize all attributes which aren't needed from the outside.
Remove unused flag for keyparser.
Remove srcmodel attribute from completionfilter.
Update attributes in docstrings.
Remove obsolete EnumBase usertype.
Don't pass prompt object to prompter.