Export Data Transformations to ODF

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This involves storing information of the data transformations to ODF file during saving so that it can be reapplied while opening the document ( Import data from ODF ).

Exporting data to ODF has been done in various steps as new transformations were added. Below is a list of commits that deal with this:

  1. https://gerrit.libreoffice.org/#/c/56665/
  2. https://gerrit.libreoffice.org/#/c/57217/
  3. https://gerrit.libreoffice.org/#/c/58254/
To export the sort transformations, some changes had to bedone to the existing code in this commit where I had to move the  writesort() method from WriteDatabaseRange
to free function.

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