Add a SQL update function to update a record from YAML

Add a new `db_update()` function to update an existing database record
from a YAML hash.

Had a little trouble building up the params for the prepared SQL
statement but finally managed to set up the types correctly and include
the record ID to update. Thanks to this Stack Overflow answer by
Shepmaster (https://stackoverflow.com/users/155423/shepmaster) for
pointing me in the right direction:
https://stackoverflow.com/questions/46624591/cannot-call-rusqlites-query-because-it-expects-the-type-rusqlitetypestos/46625932#46625932

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