This change has multiple parts:
- Move "BulletAsImage" test from ODT only to globalfilter and
  run it on ODT, DOC, DOCX, RTF formats and extend checks of
  the XGraphic used for the bullets and the size.
- Check if GIF is animated as we need to know this in unloaded
  graphic or bullets aren't rendered correctly if we assume
  they are animated.
- Use "Graphic" property in writerfilter to get the graphic from
  a XShape and not the "Bitmap" property which returns a Graphic
  as a MetaFile and not the original Graphic.
- Make sure "GraphicBitmap" is filled with XBitmap and not with
  XGraphic.
- Change "testFDO74215" to use the expected bullet size as it
  is in the original document. Looks like the initial bug was
  just asserting the bullet size is set to a value (non-zero).

Change-Id: I6b151c0bf9f426669e07522f0fc699fbb652046b
Reviewed-on: https://gerrit.libreoffice.org/54477Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Tomaž Vajngerl <quikee@gmail.com>