history: store command history in a file

Losing your progress in case of a crash, or when accidentally closing
aerc is annoying and costs time. This can be drastically reduced by
keeping a persistent history.

Write commands to XDG_CACHE_DIR/aerc/histfile when they are run and load
them when needed. If another instance of aerc is already writing the
file, fall back to the current model, where the history is kept in
memory.

Signed-off-by: Moritz Poldrack <git@moritz.sh>
Acked-by: Robin Jarry <robin@jarry.cc>
Acked-by: Tim Culverhouse <tim@timculverhouse.com>

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