Add records, lists and indices

A record declares named number and text fields with defaults. A list of a
record is runtime-owned state, and an index of a list always names one of
its items: it follows its item across inserts and removes and stops at the
ends. Items are read and changed by field (tasks[at].title), appended or
inserted as record values whose missing fields take defaults, and removed
by index. Using an index of another list is a compile error.

examples/tasks.aup matches a Python reference model over 4,800 random steps,
including events that fail on an empty list. Replacing it with a module
whose record gained and reordered fields keeps every item.

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