recommended update for librevenge

This recommended update for librevenge fixes the following issues:
- Version bump to 0.0.2:
+ Better handling of invalid input in RVNGDirectoryStream functions.
+ Add documentation for RVNGDirectoryStream.
+ Add text:outline-level to allowed paragraph properties. This is to allow import libraries to handle headings properly.
+ Properly handle units in all generators, instead of expecting everything is in inches.
+ Implement open/closeGroup for RVNGSVGDrawingGenerator.
+ Improve handling of layers in RVNGSVGPresentationGenerator.
+ Handle master pages in RVNGSVGDrawingGenerator and RVNGSVGPresentationGenerator.
+ Simple handling of tables in RVNGSVGDrawingGenerator and RVNGSVGPresentationGenerator: just create a text box for each cell.
+ Fix return value of RVNGStringStream::seek when seeking to end.
+ Fix some warnings found by Coverity
+ Use symbol visibility on Linux. The library only exports public functions now.
+ Fix several crashes or hangs when reading broken OLE2 or Zip files, found with the help of american-fuzzy-lop.
+ Add fo:language, fo:country and fo:script to allowed span properties.
+ Handle headings in RVNGHTMLTextGenerator

Fixed bugs
Selected Binaries
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