Ods Reader Process Nested table-row

[oleibman]

Fix #4528. Fix #2507. Ods Reader expects table:table-row to descend directly from table:table. But it turns out that it can be nested under table:table-header-rows, table:table-rows, or table:table-row-group. Similar considerations apply to table:table-column. Ods Reader is changed to process the nesting tags, and therefore the nested tags underneath them. This is a major change, but it doesn't seem to have broken any existing tests or samples.

No attempt is made to add any of the nesting tags in Ods Writer.

It should be noted that 4528 has an additional problem, which has been reported as issue #4530. It is not fixed by this PR.

This is:

• a bugfix
• a new feature
• refactoring
• additional unit tests

Checklist:

• Changes are covered by unit tests
  • Changes are covered by existing unit tests
  • New unit tests have been added
• Code style is respected
• Commit message explains why the change is made (see https://github.com/erlang/otp/wiki/Writing-good-commit-messages)
• CHANGELOG.md contains a short summary of the change and a link to the pull request if applicable
• Documentation is updated as necessary

[oleibman]

Isolating the table-row logic into its own subroutine predictably, and unavoidably, creates a new F-complexity function, and Scrutinizer doesn't like that. This is not a concern.