fpspreadsheet: Fix incorrect cell background painting of text-overflown cells in TsWorksheetGrid.

git-svn-id: http://svn.code.sf.net/p/lazarus-ccr/svn@3604 8e941d3f-bd1b-0410-a28a-d453659cc2b4
fpspreadsheet: Extend wikitables writer to write cell alignment, text color, borders and merged cells.

git-svn-id: http://svn.code.sf.net/p/lazarus-ccr/svn@3605 8e941d3f-bd1b-0410-a28a-d453659cc2b4