Tidy up the area code and factor out generic stuff into generic/util.

Several changes rolled into this:
  * Provide an interface for an append-only list that can emit signals
    when stuff is appended or removed.  (TODO: index-based operations?)
  * Pull out code with no GTK+ dependencies for possible reuse.
    Includes the dynamic_list and dynamic_list_impl (above), as well
    as progress_info and enumerators.

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