fpspreadsheet: Support reading of font from xlsx files. Add unit tests, 3 fails related to font color.

git-svn-id: http://svn.code.sf.net/p/lazarus-ccr/svn@3387 8e941d3f-bd1b-0410-a28a-d453659cc2b4
fpspreadsheet: Undo changes in package.

git-svn-id: http://svn.code.sf.net/p/lazarus-ccr/svn@3388 8e941d3f-bd1b-0410-a28a-d453659cc2b4