Fix `DEBUG_HDF5` and some minor leaks, add `fromH5` for `ref objects` · Vindaar/nimhdf5@9471bd6

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The following actions uses node12 which is deprecated and will be forced to run on node16: actions/checkout@v2. For more info: https://github.blog/changelog/2023-06-13-github-actions-all-actions-will-run-on-node16-instead-of-node12-by-default/

The following actions use a deprecated Node.js version and will be forced to run on node20: actions/checkout@v2. For more info: https://github.blog/changelog/2024-03-07-github-actions-all-actions-will-run-on-node20-instead-of-node16-by-default/

A custom '=destroy' hook which takes a 'var T' parameter is deprecated; it should take a 'T' parameter [Deprecated]

close(h5id, "") can raise an unlisted exception: Exception [Effect]

A custom '=destroy' hook which takes a 'var T' parameter is deprecated; it should take a 'T' parameter [Deprecated]

close(attr) can raise an unlisted exception: Exception [Effect]

A custom '=destroy' hook which takes a 'var T' parameter is deprecated; it should take a 'T' parameter [Deprecated]

`=destroy`(attrs.parent_id) can raise an unlisted exception: Exception [Effect]

A custom '=destroy' hook which takes a 'var T' parameter is deprecated; it should take a 'T' parameter [Deprecated]

close(dset) can raise an unlisted exception: Exception [Effect]

A custom '=destroy' hook which takes a 'var T' parameter is deprecated; it should take a 'T' parameter [Deprecated]

`=destroy`(grp.attrs) can raise an unlisted exception: Exception [Effect]

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