Improved handling against formula injection attacks in Export to ExcelJJ

Every time a possibly vulnerable cell value was found during Export to Excel, the value on that cell was modified to prevent a formula injection attack. If the value was non numeric, it would still render an apostrophe, although it should be hidden. Previous work on this issue involved the addition of a DSS which allowed this security to be disabled if the Excel was going to be consumed by an external tool, but the security implementation used to protect against calculation injection has reworked the ExcelSecurity utility function to allow the ability to change the cell style of a cell that is potentially vulnerable to formula injection attacks. This change no longer changes the cell value but instead applies a new cell style that has quotePrefix enabled.