minetest-go / mtdb / 7014852901

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feat: implement block iterator (#56)

* fix: sorry, too many connections.

database/Sql.Rows.Close() should be called as it is
a safe to call and idempotent; not calling it will keep the
underlying connection open.

Added an integration test to reproduce the issue
and a fix to it.

Fixes #53

* feat: implement block iterator for map data.

The iterator returns a go channel to allow for
concurrent access over all the data in the map,
skipping any non-existing blocks.

Fix #55

* refactor: renamed to AsBlockPos.

* testing: added error handling for iterator.

Fixed an infinite loop/invalid results returned by
the Iterator if database/data is corrupted.

* feature: allow early-stopping the iterator.

Implemented the Closer type and methods to allow
for callers to early stop the iteretor when they're done.

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