Webgrid

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- further clarity on args loaders, the order they run, how results are chained, etc. (9b89854_)
- enable grid to build a query string from attributes (400967d_)
- provide totals in rendered JSON output (20fe558_)
- update dataclass type documentation for usage of JSON grid i/o (35ae887_)
- clarify args loader documentation (7ab8d57_)

.. _9b89854: https://github.com/level12/webgrid/commit/9b89854
.. _400967d: https://github.com/level12/webgrid/commit/400967d
.. _20fe558: https://github.com/level12/webgrid/commit/20fe558
.. _35ae887: https://github.com/level12/webgrid/commit/35ae887
.. _7ab8d57: https://github.com/level12/webgrid/commit/7ab8d57

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- prevent count queries from re-executing due to sort/page options (0cf55e6_)

.. _0cf55e6: https://github.com/level12/webgrid/commit/0cf55e6

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- add a shortcut route to report grid count without other info (9d9a973_)

.. _9d9a973: https://github.com/level12/webgrid/commit/9d9a973

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- allow jinja_loader to be loaded at runtime (4851cc7_)

.. _4851cc7: https://github.com/level12/webgrid/commit/4851cc7

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- add query_select_from grid attribute (56425a6_)

.. _56425a6: https://github.com/level12/webgrid/commit/56425a6

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- provide all column labels in JSON render (ab28bfe_)

.. _ab28bfe: https://github.com/level12/webgrid/commit/ab28bfe