fpspreadsheet: Initial support for reading html files (data only, no formats, no nested tables).

git-svn-id: https://svn.code.sf.net/p/lazarus-ccr/svn@4236 8e941d3f-bd1b-0410-a28a-d453659cc2b4

components/fpspreadsheet/examples/visual/fpsctrls/main.pas

@@ -460,6 +460,7 @@ var
   F: TNumFormatForm;
   sample: Double;
 begin
+  Unused(AWorkbook);
   F := TNumFormatForm.Create(nil);
   try
     F.Position := poMainFormCenter;