[Feature request] Export to Excel

[josemi-ca]

It would be very useful for accounting and tax reporting purposes, if there was an option in the app dashboard to export the list of invoices to a spreadsheet file.

The spreadsheet would contain the invoice ID, creation date, base amount, taxes, and total amount.

A library like PHPOffice/PHPExcel could be used.
Other alternatives available: https://stackoverflow.com/questions/3930975/alternative-for-php-excel/3931142#3931142