PowerPoint 2007 Reader/Writer : Improvements on Font, RichText, Thumbnail, Presentation Properties & Shadow

[Progi1984]

• PowerPoint2007 Reader: Added support for thumbnail image - @devX2712 in #788
• Document Properties : Support for Revision & Status - @devX2712 in #788
  • PowerPoint2007 Reader
  • PowerPoint2007 Writer
• Presentation Properties : Added support to define content of the thumbnail - @devX2712 in #788
• Font : Support for Capitalization, Strikethrough, Pitch Family, Charset & Panose - @devX2712 in #788
  • PowerPoint2007 Reader
  • PowerPoint2007 Writer
• Font : Replaced Superscript/Subscript by baseline in PowerPoint2007 Writer - @devX2712 in #788
• RichText : Support for Vertical Align - @devX2712 in #788
  • PowerPoint2007 Reader
  • PowerPoint2007 Writer
• Shadow : Support for Type Inner & Reflection - @devX2712 in #788
  • PowerPoint2007 Reader
  • PowerPoint2007 Writer

Superseeds #787 by @devX2712

[Progi1984]

Thanks you @devX2712 for your improvements