Deprecate things views use that are no longer available

This should make things easier to deal with while converting packages

This is based on the 4.2 branch
They are attempting to register a command listener in this case. If it's a command we already happen to be listening for elsewhere that would work, but if they're listening for their own package command it of course won't be present in `atom.commands`. Can't think of a way to determine their intent in this case with absolute certainty.