SBHistoryView
SBHistoryView.swift missing license
SBUpdateView
SBTabView
SBLocalizationWindowController+SBWindowController
fix crashes when dismissing cover windows
SBDocumentWindow
SBBLKGUIPopUpButton
another unimplemented cell property
unneeded cellClass override
SBMessageView: don't show cancel button in alerts
forgot to delete SBTabView.h/m
fix: check title is non-empty & not just non-nil
fixes for swift updates
clean up a bunch of warnings

mostly ARC-related, changing some weak properties to unowned/unsafe_unretained ones where we know it points to something that won't be deallocated during the object's lifetime
SBBookmarkView
SBAboutView
SBWebView
fix infinite recursion
SBSourceTextView