Filter a table's rows

A table view can now carry a filter: its list goes in the byte after the
view's type (list + 1) and its code range is a block run as a column of
the list, leaving one number; the table has a row for each item the block
keeps, in the list's order. Columns read the item (ROW is the item's
position, not the row's). The filter runs once per item after a change of
the app's states, counted by a new number that never goes back (events,
points, a failed save's undo, a module replacement), and its rows serve
every cell until the next change.

pure_app_row_item and pure_app_item_row turn a table's rows into items
and back, so a host shows a focus (an index names an item) on the row it
is in and points at the item a clicked row shows. pure_app_rows now takes
a mutable app.

The checks cover rows, cells, the mapping both ways as items leave and
come back, six refusals, and 20,000 damaged filter modules.

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