Add support for the new XLSX date type in cells, denoted with attribute t="d",
used by Excel 2010.

Also refactor the code so the datetime attribute in pivot tables is also parsed
by

Add support for the new XLSX date type in cells, denoted with attribute t="d",
used by Excel 2010.

Also refactor the code so the datetime attribute in pivot tables is also parsed
by the same function, and increase the parsing accuracy to the maximum (HundredthSeconds,
instead of just Seconds).

Fixes: #127034 - xlsx file: imported DateTime cells are empty (Excel 2010 compatible)
Patch by: me

(cherry picked from commit 9621e552cdf723df9a998b3af4218407d6c66e37)

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